#include <bits/stdc++.h>
int main()
{
    constexpr int max = 1000000000;
    int 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) << "\n", 0; }
    const int r = (100 * a + p - q - 1) / (p - q);
    std::cout << r - 1 << "\n";
    return 0;
}