#include<bits/stdc++.h>
#include<cstdio>
#include<iostream>
using namespace std;
int d[101][101],x,y,z,maxx=0x7fffffff,ans,n,m;
int main(){
	freopen("djsa.in","r",stdin);
	freopen("djsa.out","w",stdout);
	scanf("%d %d\n",&n,&m);
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++)
	    d[i][j]=10000000;
	    d[i][i]=0;
	}
	for(int i=1;i<=m;i++){
		scanf("%d %d %d\n",&x,&y,&z);
		d[x][y]=z;
		d[y][x]=z;
	}
	for(int k=0;k<n;k++)
	for(int i=0;i<n;i++){
		int maxi=-0x7fffffff;
		for(int j=0;j<n;j++){
			if(d[i][k]+d[k][j]<d[i][j])
	           d[i][j]=d[i][k]+d[k][j];
			maxi=max(maxi,d[i][j]);
		}
		if(maxx>maxi){
			maxx=maxi;
			ans=i;
		}
	}
	printf("%d\n",ans);
	return 0;
}