#define _USE_MATH_DEFINES
#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <complex>
#include <string>
#include <vector>
#include <array>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
#include <iterator>
#include <memory>
#include <regex>
using namespace std;

const int MAX = 1000000000;

int main()
{
    int p, q, a;
    cin >> p >> q >> a;

    if(p <= q && a > 0){
        cout << MAX << endl;
        return 0;
    }

    int ans = 0;
    for(int i=1; i<=2000000; ++i){
        int x = i * (100 + p) / 100;
        int y = i * (100 + q) / 100 + a;
        if(x < y){
            ++ ans;
            if(i == 2000000)
                ans += MAX - i;
        }
    }
    cout << ans << endl;

    return 0;
}