We have a long seat of width X centimeters. There are many people who wants to sit here. A person sitting on the seat will always occupy an interval of length Y centimeters.  We would like to seat as many people as possible, but they are all very shy, and there must be a gap of length at least Z centimeters between two people, and between the end of the seat and a person.  At most how many people can sit on the seat?
X,Y,Z = map(int,input().split())

X,Y,Z = map(int,input().split())
answer = 0
X -= Y+2*Z
answer += 1
answer += X//(Y+Z)
print(answer)
