'use strict'

const main = input => {
	const args = input.trim().split(' ')
	const a = parseInt(args[0], 10)
	const b = parseInt(args[1], 10)
	const t = parseInt(args[2], 10)
	console.log(Math.floor((t * 1000 + 500) / (a * 1000)) * b)
}

main(require('fs').readFileSync('/dev/stdin', 'utf8'))
