import std.stdio, std.conv, std.math, std.string, std.range, std.array,
       std.algorithm;

int calc(int a, int b) {
    if(a == 0 && b == 0) {
        return 0;
    }
    float t = a.to!float * 100 / (a+b);
    return (t+0.5).to!int;
}

void main() {
    auto buf = readln().strip().split().map!(to!int)().array();
    immutable A = buf[0];
    immutable B = buf[1];

    int a, b, va, vb;

    while((va = calc(a,b)) != A || (vb = calc(b,a)) != B) {
        if(va < A) {
            a ++;
        } else if(vb < B) {
            b ++;
        } else {
            if(va > A) {
                b ++;
            } else if(vb > B) {
                a ++;
            } else {
                writeln("?");
            }
        }
    }

    writeln(a + b);
}