1 #include<cstdio> 2 using namespace std; 3 long long int f(long long int a,long long int b) 4 { 5     return (a%b==0)?b:f(b,a%b); 6 } 7 int main() 8 { 9     long long int a,b;10     scanf("%lld%lld",&a,&b);11     if(f(a,b)==1)12     {13         printf("Yes");14     }15     else16     {17         printf("No");18     }19     return 0;20 }