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#include <iostream>
void solveMatrix(int size) {
int value;
int wrong = 0;
for (int row = 0; row < size; row++) {
for (int col = 0; col < size; col++) {
std::cin >> value;
if ( (col == row && value != 1) || (col != row && value != 0) ) {
wrong = 1;
}
}
}
if (wrong)
std::cout << "NO\n";
else
std::cout << "SI\n";
}
int main() {
int size;
std::cin >> size;
while (size != 0) {
solveMatrix(size);
std::cin >> size;
}
return 0;
}
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