def check(x):
    v = k+a[x]
    c = 1
    i = 0
    for j in range(n-2,-1,-1):
        if j==x: continue
        while i < n-1 and a[i] + a[j] <= v:
            i += 1
        if i==x: i+=1
        if i >= j: break
        c += 1
        i += 1
    return c <= m
    
    
n,m,k,*a = map(int,open(0).read().split())
a.sort()
ng = -1
ok = n-1
while ok-ng > 1:
    mid = (ok+ng)//2
    if check(mid): ok = mid
    else: ng = mid
a.append(-1)
print(a[ok])