#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
using namespace std;

int main()
{
    int x, y;
    cin >> x >> y;

    for(int n=1; ; ++n){
        for(int a=0; a<=n; ++a){
            int b = n - a;
            int x2 = (100 * a + (a + b) / 2) / (a + b);
            int y2 = (100 * b + (a + b) / 2) / (a + b);
            if(x == x2 && y == y2){
                cout << n << endl;
                return 0;
            }
        }
    }
}