def add(x,y):
    return x+y

def subtract(x,y):
    return x-y

def multiply(x,y):
    return x*y

def divide(x,y):
    return x/y

print("사칙연산을 선택 하세요.")
print("1.더하기")
print("2.빼기")
print("3.곱하기")
print("4.나누기")

choice=input("선택 하세요(1/2/3/4):")

num1=int(input("첫번째 숫자:"))
num2=int(input("두번째 숫자:"))

if choice == '1':
    print(num1,"+",num2,"=", add(num1,num2))

elif choice=='2':
    print(num1,"-",num2,"=",subtract(num1,num2))

elif choice=='3':
    print(num1,"*",num2,"=",multiply(num1,num2))

elif choice=='4':
    print(num1,"/",num2,"=",divide(num1,num2))
else:
    print("잘못된 선택")