#include<bits/stdc++.h>
#define ll long long
#define all(x) x.begin(), x.end()
#define lowbit(i) ((i)&(-i))
#define pii pair<int,int>
#define endl '\n'
#define mk(x,y) make_pair(x,y)
#define popcount(x) __builtin_popcount(x)
const double pi=3.14159265358979323846;
const double eps=1e-9;
const int inf=1e9;
const long long INF=4e18;
const int mod=1e9+7;
using namespace std;
const int N=1e5+10;
pair<ll,ll> maxx(pair<ll,ll>a,pair<ll,ll>b){
    if(labs(a.first)+labs(a.second)>labs(b.first)+labs(b.second))return a;
    return b;
}
void solve()
{
    int n,k;
    cin>>n>>k;
    string s;
    cin>>s;
    pair<ll,ll>a={0,0},b={0,0};
    for(int i=0;i<s.size();i++){
        if(s[i]=='U')a.first+=1;
        else if(s[i]=='D')a.first-=1;
        else if(s[i]=='L')a.second-=1;
        else if(s[i]=='R')a.second+=1;
        b=maxx(a,b);
        // cout<<b.first<<" "<<b.second<<endl;
    }
    ll ans=1ll*labs(b.first)+1ll*labs(b.second);
    if(a!=b)ans+=(1ll*labs(b.first)+1ll*labs(b.second)-(labs(a.first)+labs(a.second)))*k-1;
    else ans=1ll*ans*k;
    cout<<ans<<endl;
}

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    
    int T=1;
    cin>>T;
    while(T--){
        solve();
    }
    return 0;
}