/* package whatever; // don't place package name! */
import java.util.*;
import java.lang.*;
import java.io.*;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
static int f(int i){
if(i==0)
return 1;
else
return i * f(i-1);
}
{
}
}
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