#include <iostream>
#include <vector>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <iomanip>
using namespace std;
using ll = long long;

int main() {
    ll p, q, a;
    cin >> p >> q >> a;
    if(p <= q) {
        cout << 1000000000 << endl;
        return 0;
    }
    int c = 100000000;
    int ans = 0;
    for(ll i = 1; i <= c; i++) {
        if(i * (100 + p) / 100 < i * (100 + q) / 100 + a) ans++;
    }
    cout << ans << endl;
    return 0;
}