#include <bits/stdc++.h>
#define REP3(i, m, n) for (int i = (m); (i) < (int)(n); ++ (i))
using namespace std;

int solve(int p, int q, int a) {
    constexpr int N = 1e9;
    if (p <= q) return N;
    int cnt = 0;
    REP3 (x, 1, N + 1) {
        cnt += (p * x / 100 < q * x / 100 + a);
        if (cnt + 1000 < x) break;
    }
    return cnt;
}

int main() {
    int p, q, a; cin >> p >> q >> a;
    cout << solve(p, q, a) << endl;
    return 0;
}