M, N, k = map(int, input().split(" ")) # number of workers

m = list(map(int, input().split(" ")))
n = list(map(int, input().split(" ")))

maxworker = 0
maxjobs = 0

worker = 1
for i in m:
        jobs = 0
        for j in n:
                if abs(i - j) > k:
                        continue

                jobs += 1
                if jobs > maxjobs:
                        maxworker = worker
                        maxjobs = jobs

        worker += 1

print(maxworker)