#include<iostream> #include<iomanip> using namespace std; int main(){ int a,b,gcd; a=15; b=18; if(a>b){ gcd=b; } else{ gcd=a; } while(gcd>1){ if(a%gcd==0&&b%gcd==0){ break; } gcd--; } cout<<gcd<<endl; return 0; }