local mod = 998244353
local function badd(x, y) return (x + y) % mod end

local n, m, t = io.read("*n", "*n", "*n")
local a, b = {}, {}
for i = 1, m do
  a[i], b[i] = io.read("*n", "*n")
  a[i], b[i] = a[i] + 1, b[i] + 1
end
local dp1, dp2 = {}, {}
for i = 1, n do
  dp1[i] = 0
end
dp1[1] = 1
for i = 1, t do
  local src = i % 2 == 1 and dp1 or dp2
  local dst = i % 2 == 1 and dp2 or dp1
  for i = 1, n do
    dst[i] = 0
  end
  for j = 1, m do
    local aj, bj = a[j], b[j]
    dst[aj] = badd(dst[aj], src[bj])
    dst[bj] = badd(dst[bj], src[aj])
  end
end
local tbl = t % 2 == 1 and dp2 or dp1
print(tbl[1])