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

int main(const int argc, const char * argv[]){
  int32_t x, y;
  if (argc < 3){
    fprintf(stderr,"Usage: %s num1 num2\n",argv[0]);
    exit(1);
  }

  x = atoi(argv[1]);
  y = atoi(argv[2]);

  if (y <= 0){
    return 0;
  }

  if (x + y < x){
    printf("Overflow happens!\n");
  }

  return 0;
}