Natalie made a mistake in the following problem.

The mistake was made in Line ___. Only input the number of the first incorrect line.

Line 1 6(4) ÷ 2 − 1 + 5
Line 2 6(4) ÷ 1 + 5
Line 3 24 ÷ 1 + 5
Line 4 24 + 5
Line 5 29