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#include <iostream> using namespace std; int gcd(int a, int b) { int res; while(b) { res = b; b = a % b; a = res; } return res; } int gcd4(int a, int b, int c, int d) { return gcd(gcd(gcd(a,b),c),d); } int main() { /* int a,b,c,d; cin >> a; cin >> b; cin >> c; cin >> d; cout << gcd4(a,b,c,d) << endl; return 0;*/ }
