#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <chrono>
#include <cmath>
#include <cstring>
#include <functional>
#include <iomanip>
#include <iostream>
#include <limits.h>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <stdio.h>
#include <vector>
#include <unordered_map>
#include <unordered_set>
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long
#define ld long double
#define all(x) (x).begin(),(x).end()
#define maxint INT32_MAX
#define minint INT32_MIN
#define maxll INT64_MAX
#define minll INT64_MIN
#define nc() (p1==p2 && (p2=(p1=buf)+fread(buf,1,100000,stdin),p1==p2)?EOF:*p1++)
#pragma GCC optimize(2)
void write(int x);
char *p1,*p2,buf[100000];
int read();
ll ksm(ll a,ll b,ll mod);
int js(int a,int b,int c){
    int ans1,ans;
    ans1=a+b>a*b?a+b:a*b;
    ans=ans1+c>ans1*c?ans1+c:ans1*c;
    return ans;
}
void yd(ll &a,ll &b,char c){
    if(c=='R')a++;
    else if(c=='L')a--;
    else if(c=='D')b++;
    else b--;
}
void solve(){
    int n,k;
    cin>>n>>k;
    string s;
    cin>>s;
    ll x,y;
    x=y=0;
    for(int i=0;i<n;i++){
        yd(x,y,s[i]);
    }
    x*=(k-1),y*=(k-1);
    x=abs(x);y=abs(y);
    ll X=0,Y=0;
    ll ans=0;
    for(int i=0;i<n;i++){
        yd(X,Y,s[i]);
        ans=max(ans,abs(X)+abs(Y));
        ans=max(ans,abs(X)+abs(Y)+x+y);
    }
    cout<<ans<<endl;
}


int main() {
    int t=1;
    cin>>t;
    while(t--) solve();
    return 0;
}



void write(int x)
{
    if(x<0)
        putchar('-'),x=-x;
    if(x>9)
        write(x/10);
    putchar(x%10+'0');
    return;
}
int read()
{
    int x=0,f=1;
    char ch=nc();
    while(ch<48||ch>57)
    {
        if(ch=='-')
            f=-1;
        ch=nc();
    }
    while(ch>=48&&ch<=57)
        x=x*10+ch-48,ch=nc();
   	return x*f;
}
ll ksm(ll a,ll b,ll mod){
    ll ans=1;
    a%=mod;
    while(b>0){
        if(b&1) ans=ans*a%mod;
        a=a*a%mod;
        b>>=1;
    }
    return ans;
}