#include<bits/stdc++.h>
using namespace std;
int main(){
	float n,x,y;
	int g;
	cin>>n>>x>>y;
	n*=100;
	g=ceil(((n-x)*1.0/(x+y)));
	cout<<g;
	return 0;
}

/**************************************************************
	Problem: 1331
	User: tangkaixuan
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/