import sys input = sys.stdin.readline MOD = 998244353 INV2 = pow(2, MOD - 2, MOD) n, m = map(int, input().split()) mons = [(x - y, x + y, m - h) for x, y, h in (map(int, input().split()) for _ in [0] * n)] imos = [] for x, y, d in mons: imos.append((x - d, y - d, 1)) imos.append((x + d, y - d, -1)) imos.append((x - d, y + d, -1)) imos.append((x + d, y + d, 1)) imos.sort() area = [0] * (n + 1) col_nows = [] x_now = -10 ** 18 for x, y, c in imos: if(x_now != x): col_nows.sort() cnt = 0 for i, (y_now, c_now) in enumerate(col_nows[:-1]): cnt += c_now y_next = col_nows[i + 1][0] area[cnt] += (y_next - y_now) % MOD * (x - x_now) % MOD x_now = x col_nows.append((y, c)) for s in area[1:]: ans = s % MOD * INV2 % MOD print(ans)