from collections import Counter
N,M,T = list(map(int,input().split()))
A = list(map(lambda x:int(x)-1,input().split()))

def check(n):
    ca = Counter(A)
    free = 0
    for i in range(N):
        if(n - ca[i] > 0):free += (n - ca[i]) // T
        ca[i] -= min(n,ca[i])
        
    return sum(ca.values()) <= free


ng,ok = 0,10**18
while(ok - ng > 1):
    mid = (ok+ng)//2
    if(check(mid)):
        ok = mid
    else:
        ng = mid
print(ok)