#include <bits/stdc++.h>

using namespace std;

using ll = long long;

// (100 + q) * x + 100 * a + 1 > (100 + p) * x
// (q - p) * x > -100 * a + 1
// x > -100 * a / (q - p) [q > p]
// x < -100 * a / (q - p) [q < p]

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll p, q, a;
    cin >> p >> q >> a;
    if (p == q) {
        cout << (a == 0 ? 0 : 1000000000) << "\n";
        return 0;
    }

    if (q > p) {
        cout << 1000000000 << endl;
        return 0;
    }

    ll x = (100 * a - 100) / (p - q);
    ll ans = x;
    for (ll i = x + 1; i <= x + 200000; i++) {
        ll v1 = (100 + p) * i / 100;
        ll v2 = (100 + q) * i / 100 + a;
        ans += (v2 > v1);
    }
    cout << ans << endl;
    return 0;
}