C code - 11 lines

Link:

C, pasted on Nov 28:

#include <stdio.h>
int main ()
{ int sum=0, N, i, c=0; N=50;
for ( i=0; i<=N; i++)
{  c+=i;  sum+=c;  }
 
printf ("SUMMA=%d", sum);
 

return 0;
}

Output:

1	SUMMA=22100