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