#include <iostream>

int main()
{
    int p, q, A;
    std::cin >> p >> q >> A;
    if(p <= q){
        std::cout << "1000000000\n";
    }else{
        int ans = 0;
        for(int i = 1; i < 100 * A; ++i){
            if(p * i / 100 - q * i / 100 < A) ++ans;
        }
        std::cout << ans << "\n";
    }
}