function main(arg) {
	arg = arg.trim().split("\n")[0].split(" ").map(Number)
	var a = arg[0]
	var b = arg[1]
	var t = arg[2]
	var result = 0
	for (var i = a;i < t + 0.5; i += a) {
		result += b
	}
	console.log(result)
  console.info('hoge');

}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));
