js 5文钱可以买一只公鸡，3文钱可以买一只母鸡，一文钱可以买3只小鸡，现在100文买100只鸡，请问各多少只

var x,y,c;
for ( x = 0; x <= 20; x++ ) {
    for ( y = 0; y <= 34; y++) {
        for ( c = 0; c <= 300; c++) {
            var s =5 * x + 3 * y + c / 3;
            var m =x + y + c;
            if (s == 100 &&  m== 100 && (c % 3) === 0) {
               var a= ("公鸡" + x + "母鸡" + y + "小鸡" + c);
            }
        }
    }
}
         alert(a)