#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<cstdlib>
#define MAXN 100000000
using namespace std;
int a[500][500],pos,n,m;
inline int Main(){
	freopen("djsa.in","r",stdin);
	freopen("djsa.out","w",stdout);
	cin>>n>>m;
	for (int i=0;i<n;i++)
	 for (int j=0;j<n;j++)
	  a[i][j]=MAXN;
	for (int i=0;i<m;i++)
	{
		int x,y,z;
		cin>>x>>y>>z;
		a[x][y]=a[y][x]=z;
	}
	for (int k=0;k<n;k++)
	 for (int i=0;i<n;i++)
	  if (i!=k)
	   for (int j=0;j<n;j++)
		if (i!=j)
		 if (a[i][k]+a[k][j]<a[i][j]) a[i][j]=a[i][k]+a[k][j];
	int maxx=MAXN;int max;
	for (int i=0;i<n;i++)
	{
		max=-MAXN;
		for (int j=0;j<n;j++)
		 if (i!=j)
		 {
				if (a[i][j]>max) max=a[i][j];
		 }
		if (max<maxx)
		{
			pos=i;
			maxx=max;
		}
	}
	cout<<pos;
	fclose(stdin);
	fclose(stdout);
	return 0;
}
int work=Main();
int main(){;}