#include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) begin(v),end(v)
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }
using ll = long long;
using pii = pair<int, int>;
constexpr ll INF = 1ll<<30;
constexpr ll longINF = 1ll<<60;
constexpr ll MOD = 1000000007;
constexpr bool debug = false;
//---------------------------------//

int main() {
	int P, Q, A;
	cin >> P >> Q >> A;
	constexpr int p10 = 1000000000;
	int ans;
	if (P == Q) ans = A == 0 ? 0 : p10;
	else if (P < Q) {
		if (A > 0) ans = p10;
		else {
			FOR(i, 1, 101) ans += Q * i / 100 > P * i / 100;
			ans += p10 - 100;
		}
	}
	else {
		for (int i = 1;; ++i) {
			int a = i + P * i / 100;
			int b = i + Q * i / 100 + A;
			ans += a < b;
			if (a - b >= 1) break;
		}
	}
	
	cout << ans << endl;
}