#include <bits/stdc++.h>
using usize = std::size_t;
int main()
{
    constexpr usize max = 1000000000;
    constexpr usize rep = 1000000;
    usize p, q, a;
    std::cin >> p >> q >> a;
    usize ans = 0;
    for (usize x = 1; x <= rep; x++) {
        if (x * p / 100 < x * q / 100 + a) { ans++; }
    }
    if (p < q or (p == q and a > 0)) { ans += (max - rep); }
    std::cout << ans << "\n";
    return 0;
}