The answer is: at least 52 people.
The analysis is as follows:
1, there are two more people for five consecutive people, that is to say, the number is a multiple of 5 +2, because the mantissa of the multiple of 5 is either 0 or 5, so the mantissa of this number is either 2 or 7.
2, four people in a row, no more, no less, indicating that this number is even, so excluding the mantissa of 7, the mantissa of this number can only be 2.
3. There are two people missing from six people in a column, which means that the number +2 is a multiple of 6, that is to say, the multiple mantissa of 6 is 4, the minimum mantissa is 4, and the multiple of 6 is 54.
So this number is 54-2=52.
I hope I can help you ~ ~