#include <bits/stdc++.h>
using namespace std;
#define int long long

#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;

signed main() {
    cin.tie(0)->sync_with_stdio(0);
    int t;
    cin >> t;
    while(t--){
        int n,k;
        cin >> n >> k;
        string s;
        cin >> s;
        int ans = 0;
        int x = 0;
        int y = 0;
        for(int i = 0; i<n; i++){
            if(s[i] == 'R')x++;
            if(s[i] == 'L')x--;
            if(s[i] == 'U')y++;
            if(s[i] == 'D')y--;
            ans = max(ans,abs(x)+abs(y));
        }
        x*=k-1;
        y*=k-1;
        ans = max(ans,abs(x)+abs(y));
        for(int i = 0; i<n; i++){
            if(s[i] == 'R')x++;
            if(s[i] == 'L')x--;
            if(s[i] == 'U')y++;
            if(s[i] == 'D')y--;
            ans = max(ans,abs(x)+abs(y));
        }
        cout << ans << '\n';
    }
    return 0;
}