#include <cstdio>

#include <cstring>

#include <iostream>

#define maxn 1005

#define maxm 1000005

using namespace std;

struct EdgeType {

    int v,e,w;

};

struct EdgeType edge[maxm<<];

int if_z,head[maxn],n,m,cnt;

int dis[maxn],que[maxm<<];

bool if_[maxn];

char Cget;

inline void in(int &now)

{

    now=,if_z=,Cget=getchar();

    while(Cget>''||Cget<'')

    {

        if(Cget=='-') if_z=-;

        Cget=getchar();

    }

    while(Cget>=''&&Cget<='')

    {

        now=now*+Cget-'';

        Cget=getchar();

    }

    now*=if_z;

}

int main()

{

    in(n),in(m);int u,v,w;

    for(int i=;i<=m;i++)

    {

        in(u),in(v),in(w);

        edge[++cnt].v=v,edge[cnt].w=w,edge[cnt].e=head[u],head[u]=cnt;

    }

    int h=,tail=;

    for(int i=;i<=n;i++) dis[i]=0x7fffffff;

    que[tail++]=,if_[]=true,dis[]=;

    while(h<tail)

    {

        for(int i=head[que[h]];i;i=edge[i].e)

        {

            if(dis[edge[i].v]>dis[que[h]]*edge[i].w)

            {

                dis[edge[i].v]=dis[que[h]]*edge[i].w;

                if(!if_[edge[i].v]) if_[edge[i].v]=true,que[tail++]=edge[i].v;

            }

        }

        if_[que[h++]]=false;

    }

    cout<<dis[n]%;

    return ;

}