class Factorial():
    def __init__(self, mod=10**9 + 7):
        self.mod = mod
        self._factorial = [1]
        self._size = 1
    
    def __call__(self, n):
        '''n! % mod'''
        if self._size < n+1:
            for i in range(self._size, n+1):
                self._factorial.append(self._factorial[-1]*i % self.mod)
        self._size = n+1
        return self._factorial[n]
factorial = Factorial()

print(factorial(int(input())))