#define _USE_MATH_DEFINES
#include<stdio.h>
#include<string>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include<queue>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include<iomanip>

//#include<bits/stdc++.h>


using namespace std;


int main() {
	
	int a, b;
	cin >> a >> b;
	if (a > b)swap(a, b);
	for (int i = 0; i <= 500; i++) {
		for (int j = 0; j <= i; j++) {
			if (i == j)continue;
			if ((j * 100 + i / 2) / i == a && ((i - j) * 100 + i / 2) / i == b) {
				cout << i << endl; return 0;
			}
		}
	}
	return 0;


}