#include <stdio.h>
#include <stdlib.h>

float foo (int n, float a[n]) {
  int i;
  float s = 0.0f;

  for (i=0; i<n; i++)
    s += a[i];

  return s;
}

int main (int argc, char *argv[]) {
  int n = atoi (argv[1]);

  float *a = malloc (n * sizeof *a);

  printf ("%f\n", foo (n, a));

  free (a);

  return 0;
}