a=eval(input("enter value:"))
b=eval(input("enter value:"))
c=eval(input("enter operation:"))
if c==1:
    c=a+b
    print(c)
elif c==2:
    c=a-b
    print(c)
elif c==3:
    c=a*b
    print(c)
else:
    c=a/b
    print(c)
