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public static void main(String[] args) {
/* Compute n! using iteration*/
Scanner sc = new Scanner (System.in);
int n = sc.nextInt();
sc.close();
int ans = 1;
for (int i = 1; i <= n; i++) {
ans*=i;
}
System.out.println(ans);
}
}
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import java.io.; import java.util.; import java.text.; import java.math.; import java.util.regex.*;
public class Solution {
}