Danny made a mistake in the following problem.

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


Line 1

21 + 35 ÷ 7 + 6(2)

Line 2

21 + 5 + 6(2)

Line 3

21 + 11(2)

Line 4

21 + 22

Line 5

43