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

ll range = 1000000;

int main()
{
	ios::sync_with_stdio(false), cin.tie(0);
	int P, Q, A;
	cin >> P >> Q >> A;
	const ll MAX = 1e9 + 1;
	ll lb = 0, ub = MAX;
	while (ub - lb > 1) {
		ll m = (lb + ub) / 2;
		if ((100 + Q) * m / 100 + A <= (100 + P) * m / 100) {
			ub = m;
		}
		else {
			lb = m;
		}
	}
	int res = lb;
	for (ll i = max(1LL, lb - range); i < min(lb + range + 1, MAX); i++) {
		if ((100 + Q) * i / 100 + A > (100 + P) * i / 100) {
			res += i > lb;
		}
		else {
			res -= i <= lb;
		}
	}
	cout << res << endl;
	return 0;
}