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import java.util.Scanner;

class Factorial

{

public static void main(String args[])

{

int n, c, f = 1;

System.out.println("Enter an integer to calculate its factorial");

Scanner in = new Scanner(System.in);

n = in.nextInt();

if (n < 0)

System.out.println("Number should be non-negative.");

else

{

for (c = 1; c <= n; c++)

f = f*c;

System.out.println("Factorial of "+n+" is = "+f);

}

}

}