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#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define sqr(x) x * x
int cmp(const void *x, const void *y)
{
return *(unsigned long *) x - *(unsigned long *) y;
}
int main()
{
FILE *f = fopen("INP.TXT", "r");
char n, i, j, s[5] = {78, 79, 10};
unsigned long *a, c;
unsigned long long b;
fscanf(f, "%hhd", &n);
a = malloc(n * sizeof(unsigned long));
for (i = 0; i < n; i++)
fscanf(f, "%ld", a + i);
fclose(f);
qsort(a, n, sizeof(unsigned long), &cmp);
for (i = 0; i + 1 < n; i++)
for (j = i + 1; j < n; j++) {
b = sqr(a[i]) + sqr(a[j]);
c = (unsigned long) sqrt(b);
if (sqr(c) == b && bsearch(&c, a, n, 4, &cmp) != NULL) {
s[0] = 89;
s[1] = 69;
s[2] = 83;
s[3] = 10;
break;
}
}
f = fopen("OUT.TXT", "w");
fputs(s, f);
fclose(f);
return 0;
}
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