91. A group of children stand in a row, first counting from left to right in a cycle of 1 to 3, with the child at the far right reporting 2; then counting from right to left in a cycle of 1 to 5, with the child at the far left reporting 3. If there are 4 children who reported 1 both times, then the group of children has $\qquad$ people.
Answer: 68