#include <stdio.h>

int main() {
 //실습1//
  /*printf("5*3/2\n");
  printf("3.14*7*7\n");
  printf("4.5*4,5*4.5\n");*/

    //실습2//
    printf("%d\n",5+3);
    printf("%d\n",7*2-4);
    printf("%d\n",15/2);
    return 0;
}