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

const long long MAX = 1000000000;
const long long sub = 10000000;
double P, Q;
long long A;

long long pfunc(long long a)
{
    double T = (double)a;
    double h = 100;
    long long res = (long long)(T*(P/h));
    return res;
}

long long qfunc(long long a)
{
    double T = (double)a;
    double h = 100;
    long long res = (long long)(T*(Q/h));
    res += A;
    return res;
}

int main()
{
    cin >> P >> Q >> A;
    if(P == Q)
    {
        if(A == 0) cout << 0 << endl;
        else cout << MAX << endl;
        return 0;
    }
    long long cnt = 0;
    for(long long i = 1; i <= sub; i++)
    {
        long long p = pfunc(i);
        long long q = qfunc(i);
        if(p < q) cnt++;
    }

    if(P < Q) cnt += MAX - sub;

    cout << cnt << endl;
    return 0;
}