'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
  let ans = 0
  
  for (let i=time; i>=A; i-=A) {
    ans += B
  }

  console.log(ans)

};

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