#line 2 "codes/header.hpp"

//%snippet.set('header')%
//%snippet.fold()%
#ifndef HEADER_H
#define HEADER_H

// template version 2.0
using namespace std;
#include <bits/stdc++.h>

// varibable settings
const long long INF = 1e18;
template <class T> constexpr T inf = numeric_limits<T>::max() / 2.1;

#define _overload3(_1, _2, _3, name, ...) name
#define _rep(i, n) repi(i, 0, n)
#define repi(i, a, b) for (ll i = (ll)(a); i < (ll)(b); ++i)
#define rep(...) _overload3(__VA_ARGS__, repi, _rep, )(__VA_ARGS__)
#define _rrep(i, n) rrepi(i, 0, n)
#define rrepi(i, a, b) for (ll i = (ll)((b)-1); i >= (ll)(a); --i)
#define r_rep(...) _overload3(__VA_ARGS__, rrepi, _rrep, )(__VA_ARGS__)
#define each(i, a) for (auto &&i : a)
#define all(x) (x).begin(), (x).end()
#define sz(x) ((int)(x).size())
#define pb(a) push_back(a)
#define mp(a, b) make_pair(a, b)
#define mt(...) make_tuple(__VA_ARGS__)
#define ub upper_bound
#define lb lower_bound
#define lpos(A, x) (lower_bound(all(A), x) - A.begin())
#define upos(A, x) (upper_bound(all(A), x) - A.begin())
template <class T> inline void chmax(T &a, const T &b) { if ((a) < (b)) (a) = (b); }
template <class T> inline void chmin(T &a, const T &b) { if ((a) > (b)) (a) = (b); }
template <typename X, typename T> auto make_table(X x, T a) { return vector<T>(x, a); }
template <typename X, typename Y, typename Z, typename... Zs> auto make_table(X x, Y y, Z z, Zs... zs) { auto cont = make_table(y, z, zs...); return vector<decltype(cont)>(x, cont); }

#define cdiv(a, b) (((a) + (b)-1) / (b))
#define is_in(x, a, b) ((a) <= (x) && (x) < (b))
#define uni(x) sort(all(x)); x.erase(unique(all(x)), x.end())
#define slice(l, r) substr(l, r - l)

typedef long long ll;
typedef long double ld;
using vl = vector<ll>;
using vvl = vector<vl>;
using pll = pair<ll, ll>;

template <typename T>
using PQ = priority_queue<T, vector<T>, greater<T>>;
void check_input() { assert(cin.eof() == 0); int tmp; cin >> tmp; assert(cin.eof() == 1); }

#if defined(PCM) || defined(LOCAL)
#else
#define dump(...) ;
#define dump_1d(...) ;
#define dump_2d(...) ;
#define cerrendl ;
#endif

#endif /* HEADER_H */
//%snippet.end()%
#line 2 "codes/solve.cpp"
template<class T=ll> using vec = vector<T>;
struct Fast { Fast() { std::cin.tie(0); ios::sync_with_stdio(false); } } fast;


int solve() {
    int dr;cin>>dr;
    int db;cin>>db;
    string s;cin>>s;
    int n = sz(s);

    vec<int> bpos, rpos;
    rep(i, n){
        if (s[i] == 'R') rpos.pb(i);
        if (s[i] == 'B') bpos.pb(i);
    }

    int ans = 0;
    rep(rs, 1<<10){
        rep(bs, 1<<10){
            vec<bool> use(30, true);
            rep(i, 10) {
                if (rs>>i&1) use[rpos[i]] = false;
                if (bs>>i&1) use[bpos[i]] = false;
            }
            string t = "";
            rep(i, 30) if (use[i]){ t += s[i]; }
            bool ok = true;
            rep(i, sz(t)){
                if (t[i] == 'R'){
                    if (i-dr >= 0 && t[i-dr] == 'R') ok = false;
                    if (i+dr < sz(t) && t[i+dr] == 'R') ok = false;
                }
                if (t[i] == 'B'){
                    if (i-db >= 0 && t[i-db] == 'B') ok = false;
                    if (i+db < sz(t) && t[i+db] == 'B') ok = false;
                }
            }

            int cnt = __builtin_popcount(bs) + __builtin_popcount(rs);
            if (ok){
                if (cnt == 6) {
                    dump(t);
                }
                chmax(ans, 30 - cnt);
            }
        }
    }
    cout << ans << endl;
    return 0; 
}


int main(){/*{{{*/
    solve();
    check_input();
    return 0;
}/*}}}*/