import math
from math import pi , e


def schet(string):
    if (string == "pi"):
        return pi
    elif (string == "e"):
        return e
    else:
        return float(string)

print ("Первое число")
x = schet(input())

print ("Операция")
a = input()

print ("Следующее число")
y = schet(input())

if (a == '*'):
    itog = x*y
elif (a == '/'):
    itog = x/y
elif (a == '+'):
    itog = x+y
elif (a == '-'):
    itog = x-y
elif (a == '%'):
    itog = x % y
elif (a == '^'):
    itog = x**y
print(itog)