#include <iostream> using namespace std; int main() { unsigned n,ok=1,f=2,p; cin>>n; while(n!=1&&ok==1) { p=0; while(n%f==0) { n=n/f; ++p; } if(p%2!=0)ok=0; ++f; } if(ok==1)cout<<"da"; else cout<<"nu"; return 0; }
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