#include<bits/stdc++.h>
using namespace std;
namespace my_std{
	#define ll long long
	#define bl bool
	ll my_pow(ll a,ll b,ll mod){
		ll res=1;
		if(!b) return 1;
		while(b){
			if(b&1) res=(res*a)%mod;
			a=(a*a)%mod;
			b>>=1;
		}
		return res;
	}
	ll qpow(ll a,ll b){
		ll res=1;
		if(!b) return 1;
		while(b){
			if(b&1) res*=a;
			a*=a;
			b>>=1;
		}
		return res;
	}
	#define db double
	#define pf printf
	#define pc putchar
	#define fr(i,x,y) for(register ll i=(x);i<=(y);i++)
	#define pfr(i,x,y) for(register ll i=(x);i>=(y);i--)
	#define go(u) for(ll i=head[u];i;i=e[i].nxt)
	#define enter pc('\n')
	#define space pc(' ')
	#define fir first
	#define sec second
	#define MP make_pair
	#define il inline
	#define inf 8e18
	#define random(x) rand()*rand()%(x)
	#define inv(a,mod) my_pow((a),(mod-2),(mod))
	il ll read(){
		ll sum=0,f=1;
		char ch=0;
		while(!isdigit(ch)){
			if(ch=='-') f=-1;
			ch=getchar();
		}
		while(isdigit(ch)){
			sum=sum*10+(ch^48);
			ch=getchar();
		}
		return sum*f;
	}
	il void write(ll x){
		if(x<0){
			x=-x;
			pc('-');
		}
		if(x>9) write(x/10);
		pc(x%10+'0');
	}
	il void writeln(ll x){
		write(x);
		enter;
	}
	il void writesp(ll x){
		write(x);
		space;
	}
}
using namespace my_std;
#define ull unsigned long long
mt19937_64 rd(1);
map<ull,ll> mp;
ll n,m,head[5050],cnt=0,dis[5050],ans=0;
ull col[5050];
bl ck[5050];
struct node{
	ll nxt,to,w;
}e[20020];
void add(ll u,ll v,ll ww){
	e[++cnt].nxt=head[u];
	e[cnt].to=v;
	e[cnt].w=ww;
	head[u]=cnt;
}
void dfs(ll fa,ll u){
	ck[u]=1;
	go(u){
		ll v=e[i].to;
		if(v==fa) continue;
		if(!ck[v]){
			dis[v]=dis[u]+e[i].w;
			dfs(u,v);
			mp[col[v]]+=e[i].w;
			col[u]^=col[v];
		}
		else if(dis[v]<dis[u]){
			ull tmp=rd();
			col[u]^=tmp;
			col[v]^=tmp;
			mp[tmp]+=e[i].w;
			ans=__gcd(ans,dis[u]-dis[v]+e[i].w);
		}
	}
}
int main(){
	n=read();
	m=read();
	fr(i,1,m){
		ll u=read(),v=read(),w=read();
		add(u,v,w);
		add(v,u,w);
	}
	fr(i,1,n) if(!ck[i]) dfs(0,i);
	for(map<ull,ll>::iterator it=mp.begin();it!=mp.end();it++) ans=__gcd(ans,2*(*it).sec);
	write(ans);
}