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a = float(input())
b = float(input())
operation = input()
if operation == '+':
print(a + b)
elif operation == '-':
print(a-b)
elif operation == '*':
print(a*b)
elif operation == '/':
print (a /b)
elif operation == 'mod':
print(a%b)
if b == 0:
print ("Деление на 0!")
elif operation == 'div':
print(a//b)
elif operation == 'pow':
print(a**b)