#include <iostream>
#include <vector>
using namespace std;
using ll = long long;
template<class T> using vec = vector<T>;
template<class T> using vvec = vector<vec<T>>;

int main(){
    ll P,Q,A;
    cin >> P >> Q >> A;
    if(P>Q || (P==Q && A!=0)){
        cout << 1000000000 << endl;
        return 0;
    }
    if(P==Q && A==0){
        cout << 0 << endl;
        return 0;
    }
    int ans = 0;
    for(int m=1;m<=1e7;m++){
        ll s = (100+P)*m/100,t = (100+Q)*m/100+A;
        ans += s<t;
    }
    cout << ans << endl;
}