// yuki 928 軽減税率
// 2019.11.30 bal4u

#include <stdio.h>

#define MAX 1000000000
#define D 50000

int main()
{
	int P, Q, A;
	int x, a, b, ans;
	
	scanf("%d%d%d", &P, &Q, &A);
	if (P < Q) ans = MAX;
	else if (P == Q) ans = A? MAX: 0;
	else {
		x = 100*A/(P-Q);
		a = x - D, b = x + D;
		if (a < 0) a = 1;
		if (b > MAX) b = MAX;
		ans = a-1;
		for (x = a; x <= b; ++x) {
			if ((P*x/100) < A + (Q*x/100)) {
				++ans;
			}
		}
	}
	printf("%d\n", ans);
	return 0;
}