function Main(input) {
	tmp = input.split(" ");
	var a = parseInt(tmp[0]);
	var b = parseInt(tmp[1]);
	var t = parseInt(tmp[2]);
	t = t+0.5;
	var ct = parseInt(t/a);
	console.log(ct*b);
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));