1971505052 3
2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 2 3 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2