# Here your code !
INF = 1 << 10

def warshal(n,e)
    g = n.times.map {|i| n.times.map {|j| i == j ? 0 : INF} }
    e.each do |u,v|
        g[u][v] = g[v][u] = 1
    end
    n.times do |i|
        n.times do |j|
            g[j][i] = g[i][j] = n.times.map {|k| g[i][k] + g[k][j] }.min
        end
    end
    g
end

def cover_all?(n, cost)
    s = 1 << (n.size - 1)
    t = (1 << n.size) - 1
    (s .. t).each do |bit|
        n.each_with_index do |u,j|
            mask = (1 << j)
            if mask & bit > 0
                DP[bit][j] = n.each_with_index.map {|v, i|
                    DP[mask ^ bit][i] + G[u][v]
                }.min || INF
            end
        end
    end
    DP[t].min <= cost
end

n,m,k = gets.split.map(&:to_i)
e = m.times.map do
    gets.split.map(&:to_i).map{|v| v - 1} 
end

G = warshal(n, e)

V = n.times.to_a.drop(1).reverse
V.select! {|v| G[0][v] <= k }

visited = [0]

DP = (1 << (k+1)).times.map { Array.new(k+1,INF) }
DP[1][0] = 0

V.all? do |v|
    if cover_all?(visited.dup << v, k + 1)
        visited << v
    end
    visited.size < k + 1
end

puts visited.inject(0){|s,v| s - 1 + (1 << v) }