class sum
{
            int i,sum,n,r;
public void getN()
{
            cout<<”Enter the value for N”;
            cin>>n;
}
            public void cal()
            {
            sum=0;
            for(i=1; i<= n; i++)
            {
                        r=i*i;
                        sum=sum+r;
            }
            cout<<”Sum of N numbers”<<sum;
            }
void main()
{
            sum s;
            s.getN();
            s.cal();
            return 0;
}