ACM JOJ 1007

#include <iostream>

using namespace std;

int main()

{

int
number,n=2000;

int
flag=0,local;


while(cin>>number)

{


flag=0;


if(number==0)


break;


else if(number==1)


{


cout<<number<<"
is a triangular number."<<endl;


cout<<"*"<<endl;


}


else


{


for(int i=2;i<2000;i++)


{


if(number==(1+i)*i/2)


{


flag=1;


local=i;


break;


}


}


if(flag)


{


cout<<number<<"
is a triangular number."<<endl;


for(int j=1;j<=local;j++)


cout<<string(j,'*')<<endl;


}


else


cout<<number<<"
is not a triangular
number."<<endl;


}

}

return
0;

}