#include <cstdio>
#include <algorithm>
using namespace std;
struct data {int x,y,z;};
data f[100005];
int n,m,a[20005],b[20005],i;
inline bool cmp(data a,data b){return a.z>b.z;}
inline int find(int x){
if(a[x]x) return x;
a[x]=find(a[x]);
return a[x];
}
inline void ad(int x,int y){
x=find(a[x]);
y=find(a[y]);
a[x]=y;
}
inline bool check(int x,int y){
x=find(x);
y=find(y);
if(xy) return true;
return false;
}
int main(){
scanf("%d%d",&n,&m);
for(i=1;i<=n;i++) a[i]=i;
for(i=1;i<=m;i++) scanf("%d%d%d",&f[i].x,&f[i].y,&f[i].z);
sort(f+1,f+m+1,cmp);
for(i=1;i<=m+1;i++){
if(check(f[i].x,f[i].y)) {printf("%d",f[i].z);break;}
else{
if(!b[f[i].x]) b[f[i].x]=f[i].y;
else {ad(b[f[i].x],f[i].y);}
if(!b[f[i].y]) b[f[i].y]=f[i].x;
else {ad(b[f[i].y],f[i].x);}
}
}
}
