import java.util.Scanner;
import java.io.Console;
public class Main {
/**
int x=0,y=0,zm=0;
do
{
scanf("%d",&x);
if (zm==3) return 0;
else
{
if ((x == 42) && (y != x) && (y != 0))
{
zm++;
y=x;
}
else y=x;
}
printf("%d\n",x);
}
while(7);
*/
public static void main
(String[] args
) { Scanner input
= new Scanner
(System.
in);
int x=0,y=0,zm=0;
do{
x = input.nextInt();
else{
if ((x == 42) && (y != x) && (y != 0))
{
zm++;
y=x;
}
else y=x;
}
}
while(0 == 0);
}
}
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