#include <iostream>
using namespace std;
int main() {
int i, j, n, p, q;
cout << "Input number of rows: "; cin >> n;
for (i = 1; i <= n; i++) {
if (i % 2 == 0) {
p = 1;
q = 0;
} else {
p = 0;
q = 1;
}
for (j = 1; j <= i; j++) {
if (j % 2 == 0)
cout << p;
else
cout << q;
}
cout << endl;
}
return 0;
}