Răspuns:
#include <bits/stdc++.h>
using namespace std;
int n,a=0;//a=suma
long long b=1;//b=produsul
int main(){
cin>>n;
do
{
a+=n%10;
b*=n%10;
n/=10;
}
while(n!=0);
//algoritmul lui euclid
while(b)
{
int r=a%b;
a=b;
b=r;
}
if(a==1)
cout<<"true";
else
cout<<"false";
return 0;
}
