def readint():
    return map(int, input().split())


n, m, t = readint()
a = list(readint())
oven = [0] * n
for x in a:
    oven[x - 1] += 1
low, high = 0, t * m
while abs(low - high) > 1:
    mid = (low + high) // 2
    yoyu = 0
    not_baked = 0
    for x in oven:
        if mid < x:
            not_baked += x - mid
        else:
            yoyu += (mid - x) // t
    if not_baked <= yoyu:
        high = mid
    else:
        low = mid
print(high)