Suzie made a mistake in the following problem.

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

Line 1
7(6) ÷ 5 + 42
Line 2
7(6) ÷ 5 + 16
Line 3
42 ÷ 5 + 16
Line 4
42 ÷ 21
Line 5
2