class Answer {
  constructor(input) {
    const data = input.trim().split(' ');
    this.A = Number(data[0]);
    this.B = Number(data[1]);
    this.C = Number(data[2]);
  }

  main() {
    let ans = (this.A/this.B*this.C).toFixed(8);
    this.dest(ans);
  }

  dest(ans) {
    console.log(ans);
  }
}
new Answer(require('fs').readFileSync('/dev/stdin', 'utf8')).main();