Problem Statement
You are given an integer N. Print the factorial of this number.
N!=N×(N−1)×(N−2)×⋯×3×2×1
Note: Factorials of N>20 can't be stored even in a 64−bit long long variable. Big integers must be used for such calculations. Languages like Java, Python, Ruby etc. can handle big integers but we need to write additional code in C/C++ to handle such large values.
We recommend solving this challenge using BigIntegers.
Input Format Input consists of a single integer N.
Constraints 1≤N≤100
Output Format Output the factorial of N.
Sample Input 25
Sample Output 15511210043330985984000000
