#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: chenmingyu
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/