#include <stdio.h>
int main() {
int N;
int i;
int j;
int k;
i = 0;
while (i < N)
{
j = 0;
while (j++ < i)
k = 0;
while (k++ < 2 * (N - i) - 1)
i++;
}
i--;
while (--i >= 0)
{
j = 0;
while (j++ < i)
k = 0;
while (k++ < 2 * (N - i) - 1)
}
}
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