An algorithm is designed to monitor and average temperature readings from an environmental sensor until a shutdown value of less than -50 is received.

1  total_temp ← 0.0
2  count ← 0
3  temp ← READ_SENSOR()
4  WHILE temp >= -50 DO
5      total_temp ← total_temp + temp
6      count ← count + 1
7      temp ← READ_SENSOR()
8  ENDWHILE
9  IF count > 0 THEN
10     avg ← total_temp / count
11 ENDIF

Identify the line number where indefinite iteration is first initiated in this algorithm.