#include <stdio.h>

int main(void){
  int x, y;
  double avg;

  printf("2 つの整数を入力してください：");
  scanf("%d %d", &x, &y);

  avg = (x + y)/2;
  printf("平均値（誤）= %f\n", avg);

  avg = (double)(x + y)/2;
  printf("平均値（正）= %f\n", avg);
 
  return 0;
}