// graph
struct Graph {
    node: i32,
    adjMatrixs: Vec<Vec<i32>>,
}
struct WeightGraph {
    node: i32,
    weight: Vec<Vec<i32>>,
}
// points
struct Point {
    x: i32,
    y: i32,
}

struct PointGroup{
    n: i32,
    point:Point,
}

use std::io;

fn read_line() -> String {
    let mut s = String::new();
    io::stdin().read_line(&mut s).unwrap();
    s
}

macro_rules! from_line {
    ($($a:ident : $t:ty),+) => {
        $(let $a: $t;)+
        {
            let _line = read_line();
            let mut _it = _line.trim().split_whitespace();
            $($a = _it.next().unwrap().parse().unwrap();)+
            assert!(_it.next().is_none());
        }
    };
}

fn solve(){
    from_line!(a: i32,b:i32,x:i32);
    for i in 1..=1000{
        if a * i >= x {
            let ans = i*b;
            println!("{}",ans);
            return;
        }
    }
}
fn main() {
    solve();
}