"use strict";
    
const main = arg => {
    arg = arg.trim().split("\n");
    const A = ~~arg[0].split(" ")[0];
    const B = ~~arg[0].split(" ")[1];
    const T = ~~arg[0].split(" ")[2];
    
    console.log(B * Math.floor(T / A));
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));