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measures = [int(i) for i in open("input.txt", 'r').read().splitlines()]
increases = 0
old = measures[0]+measures[1]+measures[2]
for i in range(3,len(measures)):
new = measures[i] + measures[i-1] + measures[i-2]
if new > old:
increases += 1
old = new
print(increases)