#include<iostream>
#include<cstdio>
#include<cctype>
using namespace std;
const int maxn=103;
const int inf=0x7f;
int n,m,g[maxn][maxn],fi,ti,wi,maxx,ans,minn=inf;
inline void in(int &x){
    x=0;int f=1;char t=getchar();
    while(!isdigit(t)){if(t=='-')f=-1;t=getchar();}
    while(isdigit(t)){x=x*10+t-48;t=getchar();}
    x*=f;
}
inline void floyd(){
	for(int k=0;k<n;k++)
	 for(int i=0;i<n;i++)
	  for(int j=0;j<=n;j++){
	  	g[i][j]=min(g[i][j],g[i][k]+g[k][j]);
	  }
}
inline int mian(){
    freopen("djsa.in","r",stdin);
	freopen("djsa.out","w",stdout);
	in(n);in(m);
	for(int i=0;i<n;i++)
	 for(int j=0;j<n;j++)
	  g[i][j]=inf;
	for(int i=0;i<m;i++){
		in(fi);in(ti);in(wi);
		g[fi][ti]=wi;g[ti][fi]=wi;
	}
	floyd();
	for(int i=0;i<n;i++){
		maxx=0;
		for(int j=0;j<n;j++){
			if(g[i][j]!=inf&&i!=j)
			maxx=max(maxx,g[i][j]);
		}
		if(maxx<minn){
			minn=maxx;ans=i;
		}
	}
	printf("%d",ans);
}
int miku=mian();
int main(){;}