33 lines
577 B
C
33 lines
577 B
C
#include <stdio.h>
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int is_equal(const int *a, int n);
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int main() {
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int a[3];
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int n = 0;
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int res = 0;
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scanf("%d", &n);
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for (int i = 1; i < n; ++i)
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for (int j = 0; j < n; ++j)
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for (int k = 0; k < n; ++k) {
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a[0] = i;
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a[1] = j;
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a[2] = k;
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if (is_equal(a, n))
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res = i * n * n + j * n + k;
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}
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printf("%d", res);
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return 0;
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}
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int is_equal(const int* a, int n) {
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long long q1 = 1ll* a[0] * n * n + a[1] * n + a[2];
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long long q2 = q1 * q1;
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if (q2 % n == a[2] && (q2 / n) % n == a[1] && (q2 / (n * n)) % n == a[0])
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return 1;
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return 0;
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}
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