#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
#define inf 0x3f3f3f3f
int n, m;
struct fuck
{
	int from, to, len;
}ed[1000005];
int id[1005];
int pre[1005];
int vis[1005];
int in[1005];
int zhuliu(int root)
{
	int res = 0;
	while (1)
	{
		for (int s = 0; s < n; s++)
			in[s] = inf;
		for (int s = 0; s < m; s++)
		{
			if (ed[s].from != ed[s].to&&in[ed[s].to] > ed[s].len)
			{
				in[ed[s].to] = ed[s].len;
				pre[ed[s].to] = ed[s].from;
			}
		}
		for (int s = 0; s < n; s++)
			if (in[s] == inf && s != root)
				return -1;
		int sum_huan = 0;
		in[root] = 0;
		memset(id, -1, sizeof(id));
		memset(vis, -1, sizeof(vis));
		for (int s = 0; s < n; s++)
		{
			res += in[s];
			int v = s;
			while (vis[v] != s&&id[v] == -1 && v != root)
			{
				vis[v] = s;
				v = pre[v];
			}
			if (v != root&&id[v] == -1)
			{
				for (int w = pre[v]; w != v; w = pre[w])
					id[w] = sum_huan;
				id[v] = sum_huan++;
			}
		}
		if (sum_huan == 0)
			break;
		for (int s = 0; s < n; s++)
		{
			if (id[s] == -1)
				id[s] = sum_huan++;
		}
		for (int s = 0; s < m; s++)
		{
			int v = ed[s].to;
			ed[s].from = id[ed[s].from];
			ed[s].to = id[ed[s].to];
			if (ed[s].from != ed[s].to)
			{
				ed[s].len -= in[v];
			}
		}
		n = sum_huan;
		root = id[root];
	}
	return res;
}
int main()
{
	int te, cas = 1;
	scanf("%d", &te);
	while (te--)
	{
		scanf("%d", &n);
		scanf("%d", &m);
		for (int s = 0; s < m; s++)
		{
			scanf("%d%d%d", &ed[s].from, &ed[s].to, &ed[s].len);
			if (ed[s].from == ed[s].to)
			{
				ed[s].len = inf;
			}
		}
		int ans = zhuliu(0);
		if (ans == -1)
		{
			printf("Case #%d: 无成图!\n", cas++);
		}
		else
		{
			printf("Case #%d: %d\n", cas++, ans);
		}
	}
}