from collections import defaultdict


n, m = list(map(int, input().split()))

g = defaultdict(list)
for _ in range(m):
    l, r, d = map(int, input().split())
    g[l].append((r, d))
    g[r].append((l, -d))


checked = {}
ds = defaultdict(int)


def check(v):
    if (not (v in ds)):
        ds[v] = 0
    for next_v, d in g[v]:
        if not (next_v in ds):
            ds[next_v] = ds[v] + d
            if check(next_v) is False:
                return False
        elif not (ds[next_v] - ds[v] == d):
            return False
    return True


valid = True
for v in range(1, n + 1):
    if check(v):
        valid = False
        break

if valid:
    print("Yes")
else:
    print("No")
