#include <bits/stdc++.h>

#define rep(i,n) for(int i=0;i<(n);i++)

using namespace std;

int main(){
	int p,q,a; scanf("%d%d%d",&p,&q,&a);

	if(p<=q || a==0) return puts("0"),0;

/*
	floor(p * x / 100) < floor(q * x / 100) + a
	<=
	p * x / 100 < q * x / 100 + a - 1
	<=>
	x < (a - 1) * 100 / (p - q)

	floor(p * x / 100) >= floor(q * x / 100) + a
	<=
	p * x / 100 >= q * x / 100 + a + 1
	<=>
	x >= (a + 1) * 100 / (p - q)
*/

	int lb=(a-1)*100/(p-q);
	int ub=(a+1)*100/(p-q);

	int ans=lb-1;
	for(int x=lb;x<ub;x++) if(p*x/100<q*x/100+a) ans++;
	printf("%d\n",ans);

	return 0;
}