'use strict';
 
function Main(input) {
  const A = Number(input.split(" ")[0])
  const B = Number(input.split(" ")[1])
  const T = Number(input.split(" ")[2])
 
  const time = T + 0.5
  console.log(Math.floor(time / A) * B)
 
};
 
Main(require("fs").readFileSync("/dev/stdin", "utf8").trim());