#include <cstdio>
#include <algorithm>
using namespace std;
 
#define lson l , m , rt << 1
#define rson m + 1 , r , rt << 1 | 1
const int maxn = 111111;
int h , w , n;
int col[maxn<<2];
int sum[maxn<<2];
void PushUp(int rt) {
       sum[rt] = sum[rt<<1] + sum[rt<<1
 
|1];
}
void PushDown(int rt,int m) {
       if (col[rt]) {
              col[rt<<1] = col[rt<<1|1] = col[rt];
              sum[rt<<1] = (m - (m >> 1)) * col[rt];//(m - (m >> 1))左子樹的區間長度
              sum[rt<<1|1] = (m >> 1) * col[rt];
              col[rt] = 0
 
;
       }
}
void build(int l,int r,int rt) {
       col[rt] = 0;
       sum[rt] = 1;
       if (l == r) return ;
       int m = (l + r) >> 1;
       build(lson);
       build(rson);
       PushUp(rt);
}
void update(int L,int R,int c,int l,int r,int rt) {
       if (L <= l && r <= R) {
              col[rt] = c;
              sum[rt] = c * (r - l + 1
 
);
              return ;
       }
       PushDown(rt , r - l + 1);
       int m = (l + r) >> 1;
       if (L <= m) update(L , R , c , lson);
       if (R > m) update(L , R , c , rson);
       PushUp(rt);
}
int main() {
       int T , n , m;
       scanf("%d",&T);
       for (int cas = 1 ; cas <= T ; cas ++) {
              scanf("%d%d",&n,&m);
              build(1 , n , 1);
              while (m --) {
                     int a , b , c;
                     scanf("%d%d%d",&a,&b,&c);
                     update(a , b , c , 1 , n , 1);
              }
              printf("Case %d: The total value of the hook is %d.\n",cas , sum[1]);
       }
       return 0;
}