/*
 *   Version : 1.0 (Last Modified by Nojima, 2004-12-04)
 */

var weight = {
"H":1.007947, "He":4.0026022, "Li":6.9412, "Be":9.0121823, "B":10.8117,
"C":12.01078, "N":14.00672, "O":15.99943, "F":18.99840325, "Ne":20.17976,
"Na":22.9897702, "Mg":24.30506, "Al":26.9815382, "Si":28.08553, "P":30.9737612,
"S":32.0655, "Cl":35.4532, "Ar":39.9481, "K":39.09831, "Ca":40.0784,
"Sc":44.9559108, "Ti":47.8671, "V":50.94151, "Cr":51.99616, "Mn":54.9380499,
"Fe":55.8452, "Co":58.9332009, "Ni":58.69342, "Cu":63.5463, "Zn":65.4094,
"Ga":69.7231, "Ge":72.641, "As":74.921602, "Se":78.963, "Br":79.9041,
"Kr":83.7982, "Rb":85.46783, "Sr":87.621, "Y":88.905852, "Zr":91.2242,
"Nb":92.906382, "Mo":95.942, "Tc":98, "Ru":101.072, "Rh":102.905502,
"Pd":106.421, "Ag":107.86822, "Cd":112.4118, "In":114.8183, "Sn":118.7107,
"Sb":121.7601, "Te":127.603, "I":126.904473, "Xe":131.2936, "Cs":132.905452,
"Ba":137.3277, "La":138.90552, "Ce":140.1161, "Pr":140.907652, "Nd":144.243,
"Pm":145, "Sm":150.363, "Eu":151.9641, "Gd":157.253, "Tb":158.925342,
"Dy":162.5001, "Ho":164.930322, "Er":167.2593, "Tm":168.934212, "Yb":173.043,
"Lu":174.9671, "Hf":178.492, "Ta":180.94791, "W":183.841, "Re":186.2071,
"Os":190.233, "Ir":192.2173, "Pt":195.0782, "Au":196.966552, "Hg":200.592,
"Tl":204.38332, "Pb":207.21, "Bi":208.980382, "Po":209, "At":210,
"Rn":222, "Fr":223, "Ra":226, "Ac":227, "Th":232.03811,
"Pa":231.035882, "U":238.028913, "Np":237, "Pu":244, "Am":243,
"Cm":247, "Bk":247, "Cf":251, "Es":252, "Fm":257,
"Md":258, "No":259, "Lr":262, "Rf":261, "Db":262,
"Sg":266, "Bh":264, "Hs":277, "Mt":268, "Ds":281,
"Rg":272,/*###*/ "D":2, "T":3, "Me":15.03462, "Et":29.06130,
"Ph":91.13109, "Bz":105.1146
}

function chemformMatch(str){
	var cmp;
	if(str.match(/[^a-zA-Z\d\(\)\{\}\[\]\^\+\-\u30FB\uFF65\*]/)) return false;
	if(str.match(/[^A-Z][a-z]/)) return false;
	if(str.match(/[^a-zA-Z\d\)\}\^\u30FB\uFF65\*]\d|\D0/)) return false;
	if(str.match(/[^a-zA-Z\d\)\}\]]\^|\^[^1-9]|\D[\+\-]|\^\d+[^\d\+\-]|[^\d\^]\d*[\+\-]/)) return false;
	if(str.match(/\(\)|\{\}|\[\]/)) return false;
	if(str.match(/[\u30FB\uFF65\*]{2}/)) return false;
	if(str.charAt(0).match(/[a-z\^\+\-\u30FB\uFF65\*]|\d+[\+\-]/)) return false;

	while(true){
		cmp = str;
		str = str.replace(/\([^\(\)\{\}\[\]\u30FB\uFF65\*]*\)/g, "");
		str = str.replace(/\{[^\(\)\{\}\[\]\u30FB\uFF65\*]*\}/g, "");
		str = str.replace(/\[[^\(\)\{\}\[\]\u30FB\uFF65\*]*\]/g, "");
		if(cmp == str) break;
	}
	return str.match(/[\(\)\{\}\[\]]/) ? false : true;
}

function calculateWeight(str){
	var i, j, k, n, chr, num_l;
	var num = new Array();
	var sum = 0;

	str = str.replace(/\^\d+[\+\-]|[\[\]]/g, "");
	str = str.split(/[\u30FB\uFF65\*]/);

	for(i = 0; i < str.length; i++){
		if(str[i].charAt(0).match(/[1-9]/)){
			num[0] = parseInt(str[i].match(/[1-9]\d*/));
		}
		else num[0] = 1;
		num_l = 1;
		n = 1; //元素や原子団の記号の直後にある数
		for(j = str[i].length - 1; j >= 0; j -= 1){
			chr = str[i].charAt(j);
			if(chr.match(/[A-Z]/)){
				for(k = 0; k < num_l; k++){
					n *= num[k];
				}
				k = weight[chr];
				if(!k) return false;
				sum += n * k;
				n = 1;
			}
			else if(chr.match(/[a-z]/)){
				for(k = 0; k < num_l; k++){
					n *= num[k];
				}
				j -= 1;
				k = weight[str[i].charAt(j) + chr];
				if(!k) return false;
				sum += n * k;
				n = 1;
			}
			else if(chr.match(/\d/)){
				k = j;
				while(str[i].charAt(k - 1).match(/\d/)) k -= 1;
				n = parseInt(str[i].substring(k, j + 1));
				j = k;
			}
			else if(chr.match(/[\)\}]/)){
				num[num_l] = n;
				num_l++;
				n = 1;
			}
			else if(chr.match(/[\(\{]/)){
				num_l -= 1;
				n = 1;
			}
			else {
				return false;
			}
		}
	}
	return Math.round(sum * 100000000) / 100000000;
}