1 import java.io.*; 2 import java.lang.*; 3 import java.text.*; 4 import java.util.*; 5 import java.math.*; 6 class Main 7 { 8     public static void main(String[] argc) 9     {10         Scanner cin=new Scanner(System.in);11         BigInteger a1,n,i;12         while(cin.hasNextBigInteger())13         {14             a1=cin.nextBigInteger();15             n=BigInteger.valueOf(1);16             for(i=BigInteger.valueOf(1);i.compareTo(a1)<=0;i=i.add(BigInteger.valueOf(1)))17             {18                 n=n.multiply(i);19             }20             System.out.println(n);21         }22     }23 }

 

1 import java.util.*; 2 import java.math.*; 3 class Main 4 { 5     public static void main(String args[]) 6     { 7         Scanner cin=new Scanner(System.in); 8         BigInteger a; 9         int n,i;10         while(cin.hasNext())11         {12             n=cin.nextInt();13             a=BigInteger.valueOf(1);14             for(i=1;i<=n;i++)15             {16                 a=a.multiply(BigInteger.valueOf(i));17             }18             System.out.println(a);19         }20     }21 }