2

firstLine = input().split()
secondLine = input().split()

count = int(firstLine[0])
allTime = int(firstLine[1])
relaxTime = int(firstLine[2])

times = [int(item) for item in secondLine]

hardTime = -1

for i in range(count):
    allTime -= times[i]

if allTime >= 0:
    times.pop()
    relaxCount = allTime // relaxTime
    times.sort()
    if relaxCount - 1 >= count - 1:
        hardTime = 1
    else:
        if (len(times) == 0):
            hardTime = 1
        else:
            hardTime = times[-1 - relaxCount] + 1
elif allTime < 0:
    hardTime = -1

print(hardTime)