#include<bits/stdc++.h>
using namespace std;

int main(){
    long long A,x;
    long long result=-1;
    double P,Q;

    cin>>P>>Q>>A;

    P=1+P/100;//店内
    Q=1+Q/100;//持ち帰り

    for(x=0;x<=1000000000;x++){
        if((long long)(x*P)<(long long)(x*Q)+A){
            result++;
        }
    }
    
    if(result<0)result=0;

    cout<<result<<endl;
}