# include <bits/stdc++.h>
# define maxn 100001
# define ll long long
# define clock (clock() * 1000.0 / CLOCKS_PER_SEC)
# define rc(s) return cout << s,0
# define _ ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
# define pb push_back
# define mp make_pair
//# define int ll
using namespace std;
const int inf = (1e9);

inline int readChar();
template <class T = int> inline T readInt();
template <class T> inline void writeInt( T x, char end = 0 );
inline void writeChar( int x );
inline void writeWord( const char *s );

/** Read */

static const int buf_size = 4096;

inline int getChar() {
    static char buf[buf_size];
    static int len = 0, pos = 0;
    if (pos == len)
        pos = 0, len = fread(buf, 1, buf_size, stdin);
    if (pos == len)
        return -1;
    return buf[pos++];
}

inline int readChar() {
    int c = getChar();
    while (c <= 32)
        c = getChar();
    return c;
}

template <class T>
inline T readInt() {
    int s = 1, c = readChar();
    T x = 0;
    if (c == '-')
        s = -1, c = getChar();
    while ('0' <= c && c <= '9')
        x = x * 10 + c - '0', c = getChar();
    return s == 1 ? x : -x;
}

inline ll readLong() {
    int s = 1, c = readChar();
    ll x = 0;
    if (c == '-')
        s = -1, c = getChar();
    while ('0' <= c && c <= '9')
        x = x * 10 + c - '0', c = getChar();
    return s == 1 ? x : -x;
}

/** Write */

static int write_pos = 0;
static char write_buf[buf_size];

inline void writeChar( int x ) {
    if (write_pos == buf_size)
        fwrite(write_buf, 1, buf_size, stdout), write_pos = 0;
    write_buf[write_pos++] = x;
}

template <class T>
inline void writeInt( T x, char end ) {
    if (x < 0)
        writeChar('-'), x = -x;

    char s[24];
    int n = 0;
    while (x || !n)
        s[n++] = '0' + x % 10, x /= 10;
    while (n--)
        writeChar(s[n]);
    if (end)
        writeChar(end);
}

inline void writeWord( const char *s ) {
    while (*s)
        writeChar(*s++);
}

struct Flusher {
    ~Flusher() {
        if (write_pos)
            fwrite(write_buf, 1, write_pos, stdout), write_pos = 0;
    }
} flusher;


vector<pair<int,int>>vec[18];
int dp[(1 << 19)][18];
int n,m,x,y,cst;
int mn;

int32_t main(){_
    freopen("hamilton.in","r",stdin);
    freopen("hamilton.out","w",stdout);
    n = readInt();
    m = readInt();
    while(m --)
    {
		x = readInt();
		y = readInt();
		cst = readInt();
        vec[y].pb(mp(x,cst));
	}
	for(int i = 0;i < (1 << n);i++)
		for(int j = 0;j < n;j++)
			dp[i][j] = inf;
	dp[1][0] = 0;
	for(int mask = 0;mask < (1 << n);mask++)
	{
        for(int lst = 0;lst < n;lst ++)
        {
            for(auto it : vec[lst])
            {
				if(mask & (1 << it.first))
					dp[mask][lst] = min(dp[mask][lst],dp[mask ^ (1 << lst)][it.first] + it.second);
            }
        }
	}
	mn = inf;
	for(auto it : vec[0])
	{
        mn = min(mn,dp[(1 << n) - 1][it.first] + it.second);
	}
	if(mn < inf) writeInt(mn);
    else writeWord("Nu exista solutie");
}