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14 lines
328 B
C++
14 lines
328 B
C++
#define _CRT_SECURE_NO_WARNINGS
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#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
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#include <bits/stdc++.h>
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using namespace std;
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int main()
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{
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int n;
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scanf("%d", &n);
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printf("%d %d\n", n - 1, n);
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for (int i = 0; i < n; i++)
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printf("%d %d\n", (i % n) + 1, ((i + 1) % n) + 1);
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return 0;
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}
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