#include <cstdio>

bool valid(int N, int A, int B) {
  for (int i = 0; i <= N; ++i) {
    int a = ((1000*i) / N + 5) / 10;
    int b = ((1000*(N-i)) / N + 5) / 10;
    if (A == a && B == b) return true;
  }
  return false;
}

int main() {
  int A, B;
  scanf("%d %d", &A, &B);

  for (int i = 1; i <= 1000; ++i)
    if (valid(i, A, B))
      return !printf("%d\n", i);

  return 1;
}