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s = input()
a, b, c = s.split()
a = int(a)
b = int(b)
c = int(c)
print((a+b) * c)

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a, b, c = map(int, input().split())
print((a+b) * c)

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s =input()
arr = s.split()
a =int(arr[0])
b =int(arr[1])
c =int(arr[2])
print((a+b) * c)

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a=int(int("a:"))
b=int(int("b:"))
c=int(int("c:"))
result=(a+b)*c
print(result)

input("请输入一个字符串：")