Problem: There are N people standing on the x-axis. Let the coordinate of Person i be x_i. For every i, x_i is an integer between 0 and 10^9 (inclusive). It is possible that more than one person is standing at the same coordinate.

You will given M pieces of information regarding the positions of these people. The i-th piece of information has the form (L_i, R_i, D_i). This means that Person R_i is to the right of Person L_i by D_i units of distance, that is, x_{R_i} - x_{L_i} = D_i holds.

It turns out that some of these M pieces of information may be incorrect. Determine if there exists a set of values (x_1, x_2, ..., x_N) that is consistent with the given pieces of information.

Constraints

* 1 \leq N \leq 100 000
* 0 \leq M \leq 200 000
* 1 \leq L_i, R_i \leq N (1 \leq i \leq M)
* 0 \leq D_i \leq 10 000 (1 \leq i \leq M)
* L_i \neq R_i (1 \leq i \leq M)
* If i \neq j, then (L_i, R_i) \neq (L_j, R_j) and (L_i, R_i) \neq (R_j, L_j).
* D_i are integers.

Input

Input is given from Standard Input in the following format:


N M
L_1 R_1 D_1
L_2 R_2 D_2
:
L_M R_M D_M


Output

If there exists a set of values (x_1, x_2, ..., x_N) that is consistent with all given pieces of information, print `Yes`; if it does not exist, print `No`.

Examples

Input

3 3
1 2 1
2 3 1
1 3 2


Output

Yes


Input

3 3
1 2 1
2 3 1
1 3 5


Output

No


Input

4 3
2 1 1
2 3 5
3 4 2


Output

Yes


Input

10 3
8 7 100
7 9 100
9 8 100


Output

No


Input

100 0


Output

Yes

Solution (in CPP):

Solution:
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
const long long MAXN=100005;
long long fa[MAXN],jl[MAXN];
long long n,m;
long long find(long long x)
{
	if(fa[x]==x)
		return x;
	long long f=find(fa[x]);
	jl[x]=jl[fa[x]]+jl[x];
	fa[x]=f;
	return f;
}
int main()
{
	scanf("%lld %lld",&n,&m);
	for(long long i=1;i<=n;i++)
		fa[i]=i,jl[i]=0;
	for(long long i=1;i<=m;i++)
	{
		long long l,r,d;
		scanf("%lld %lld %lld",&l,&r,&d);
		long long a=find(l),b=find(r);
		if(a==b)
		{
			if(jl[l]-jl[r]!=d)
			{
				printf("No\n");
				return 0;
			}
		}
		else
		{
			fa[b]=a;
			jl[b]=-d+jl[l]-jl[r];
		}
	}
	printf("Yes\n");
}