#include <bits/stdc++.h>
using namespace std;
#define modulo 1000000007
#define mod(mod_x) ((((long long)mod_x+modulo))%modulo)
#define Inf 1000000000

int main(){
	
	long long P,Q,A;
	cin>>P>>Q>>A;
	
	if(P<Q){
		cout<<1000000000<<endl;
	}
	else if(P==Q){
		if(A==0)cout<<0<<endl;
		else cout<<1000000000<<endl;
	}
	else{
		int ans = 0;
		for(long long i=1;true;i++){
			long long a = (P+100)*i;
			a/=100;
			long long b = (Q+100)*i;
			b/=100;
			b+=A;
			if(a<b)ans++;
			if(a-b>100)break;
		}
		
		cout<<ans<<endl;
	}
	
	
	return 0;
	
}