#include <iostream> using namespace std; int he(int num) { int sum = 0; for (int i = 1; i < num; i++) { if (num % i == 0) { sum += i; } } return sum; } bool x(int a, int b) { int sumA = he(a); int sumB = he(b); return sumA == b && sumB == a; } int main() { int a, b; cin >> a >> b; if (x(a, b)) { cout << "yes" << endl; } else { cout << "no" << endl; } return 0; }