import java.util.*;
class Seven
{
public static void main(String[] args)
{
Scanner Sc=new Scanner(System.in);
System.out.println("请输入一个运算符号");
char n=Sc.nextChar();
int a = 34;
int b = 17;
switch (n)
{
case '*':System.out.println(a*b);break;
case '/':System.out.println(a/b);break;
case '+':System.out.println(a+b);break;
case '-':System.out.println(a-b);break;
default: System.out.println("请输入一个四则运算符");