function Main(input) {
  var input = input.split(" ").map(val => parseInt(val, 10));

  var a = input[0];
  var b = input[1];
  var t = input[2] + 0.5;

  var result =Math.floor(t / a) * b; 


  console.log(result);
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));