#include <iostream>

int main()
{
    long long p, q, A;
    std::cin >> p >> q >> A;
    long long P = p, Q = q;
    int ans = 0;
    for(int i = 1; i <= 1000000000; ++i, P += p, Q += q) {
        ans += (P / 100 - Q / 100 < A);
    }
    std::cout << ans << std::endl;
    return 0;
}