#include <bits/stdc++.h>
using usize = std::size_t;
int main()
{
    constexpr usize max = 1000000000;
    usize p, q, a;
    std::cin >> p >> q >> a;
    usize ans = 0;
    for (usize x = 1; x <= max; x++) {
        const usize eat_in   = x * p / 100;
        const usize take_out = x * q / 100 + a;
        if (eat_in < take_out) { ans++; }
    }
    std::cout << ans << std::endl;
    return 0;
}