#include <stdio.h>

int main() {

   float a, b, c, sum;

   printf( "Enter 3 numbers:  " );
   scanf( "%f%f%f", &a, &b, &c );

   sum = a + b + c;

   printf( "sum is %f\n", sum );
   printf( "average is %f\n", sum / 3 );

   return 0;
}