Problem:
Score : 100 points

Problem Statement

A biscuit making machine produces B biscuits at the following moments: A seconds, 2A seconds, 3A seconds and each subsequent multiple of A seconds after activation.

Find the total number of biscuits produced within T + 0.5 seconds after activation.

Constraints

All values in input are integers.

1 \leq A, B, T \leq 20

Input

Input is given from Standard Input in the following format:

A B T

Output

Print the total number of biscuits produced within T + 0.5 seconds after activation.

Sample Input 1

3 5 7

Sample Output 1

10

Five biscuits will be produced three seconds after activation.

Another five biscuits will be produced six seconds after activation.

Thus, a total of ten biscuits will be produced within 7.5 seconds after activation.

Sample Input 2

3 2 9

Sample Output 2

6

Sample Input 3

20 20 19

Sample Output 3

0

Solution in Rust (1.15.1) (judge verdict: Accepted)

//https://qiita.com/tanakh/
#[allow(unused_macros)]
macro_rules! input {
	(source = $s:expr, $($r:tt)*) => {
		let mut iter = $s.split_whitespace();
		let mut next = || { iter.next().unwrap() }; 
		input_inner!{next, $($r)*}
	};
	($($r:tt)*) => {

		let stdin = std::io::stdin();
		let mut bytes = std::io::Read::bytes(std::io::BufReader::new(stdin.lock())); 
		let mut next = move || -> String{
			bytes
				.by_ref()
				.map(|r|r.unwrap() as char) 
				.skip_while(|c|c.is_whitespace()) 
				.take_while(|c|!c.is_whitespace()) 
				.collect()
			};
	input_inner!{next, $($r)*} 
	};
}

#[allow(unused_macros)]
macro_rules! input_inner { 
	($next:expr) => {}; 
	($next:expr, ) => {};

	($next:expr, $var:ident : $t:tt $($r:tt)*) => { 
		let $var = read_value!($next, $t); 
		input_inner!{$next $($r)*}
	}; 
}
#[allow(unused_macros)]
macro_rules! read_value { 
	($next:expr, ( $($t:tt),* )) => {
		( $(read_value!($next, $t)),* ) 
	};
	
	($next:expr, [ $t:tt ; $len:expr ]) => {
		(0..$len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()
	};

	($next:expr, chars) => {
		read_value!($next, String).chars().collect::<Vec<char>>()
	};
	
	($next:expr, bytes) => {
		read_value!($next, String).into_bytes()
	};
	
	($next:expr, usize1) => { 
		read_value!($next, usize) - 1
	};

	($next:expr, $t:ty) => {
		$next().parse::<$t>().expect("Parse error")
	};
}

fn main(){
    input!{
        a : i64,
        b : i64,
        t : i64,
    }
    let mut tmp : i64 = 0;
    let mut ans : i64 = 0;
    tmp = t / a;
    ans = tmp * b;
    println!("{}",ans);
}