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#include <iostream>
int main() {
freopen("tije.in", "r", stdin);
freopen("tije.out", "w", stdout);
int N;
std::cin >> N;
for(int i = 1; i <= N; i++) {
for(int j = 1; j <= N; j++) {
std::cout << i << ' ' << N + 1 << '\n';
}
}
for(int i = 1; i <= N; i++) {
for(int j = 1; j <= N; j++) {
std::cout << N + 1 << ' ' << j << '\n';
}
}
return 0;
}