function setUp(input) {
  input = input.split("\n");
  tmp = input[0].split(" ");
  A = Number(tmp[0]);
  B = Number(tmp[1]);
  T = Number(tmp[2]);
  main();
}
function main() {
  var time = Math.floor(T / A);

  console.log(time * B);
}

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