#include<iostream>
using namespace std;
typedef long long ll;

int main(){
    double p, q;
    int a;
    cin >> p >> q >> a;
    if(a == 0 && p == q){
        cout << 0 << endl;
        return 0;
    } 
    if(p <= q && a != 0){
        cout << 1000000000 << endl;
        return 0;
    }
    int ret = 0;
    for(double i = 1; i <= a*(p-q)*100; i++){
        if((int)(i*p/100) - (int)(i*q/100) < a) ret++;
    }
    cout << ret << endl;
    return 0;
}