#include <stdio.h>

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

  printf("1 つの整数を入力してください：");
  scanf("%d", &x);
  
  y = x * 0.8;

  printf("x = %d\n", x);
  printf("0.8 x = %f\n", y);
 
  return 0;
}