#include <stdio.h>

int imult(int a, int b)
{
  int product;

  if (b <= 0) return 0;
  return a + imult(a, b-1);
}

main(int argc, char **argv)
{
  if (argc != 3) {
    fprintf(stderr, "usage: mult1 a b\n");
    exit(1);
  }
  
  printf("%d\n", imult(atoi(argv[1]), atoi(argv[2])));
}