#include <bits/stdc++.h>

//    #include <boost/multiprecision/cpp_int.hpp>
 #define int long long
 #define inf  1000000007
 #define pa pair<int,int>
 #define ll long long
 #define pal pair<double,double>
 #define ppap pair<pa,int>
  #define PI 3.14159265358979323846
  #define paa pair<int,char>
  #define  mp make_pair
  #define  pb push_back
  #define EPS (1e-10)
                                          
    int dx[8]={0,1,0,-1,1,1,-1,-1};
    int dy[8]={1,0,-1,0,-1,1,1,-1};
                                            using namespace std;
                                   			class pa3{
                                            	public:
                                            	int x;
                                   				int y,z;
                                            	pa3(int x=0,int y=0,int z=0):x(x),y(y),z(z) {}
                                            	bool operator < (const pa3 &p) const{
                                            		if(x!=p.x) return x<p.x;
                                            		if(y!=p.y) return y<p.y;
                                            		 return z<p.z;
                                            		//return x != p.x ? x<p.x: y<p.y;
                                            	}
                                   				bool operator > (const pa3 &p) const{
                                            		if(x!=p.x) return x>p.x;
                                            		if(y!=p.y) return y>p.y;
                                            		 return z>p.z;
                                            		//return x != p.x ? x<p.x: y<p.y;
                                            	}
                                            	bool operator == (const pa3 &p) const{
                                            		return x==p.x && y==p.y && z==p.z;
                                            	}
                                            		bool operator != (const pa3 &p) const{
                                            			return !( x==p.x && y==p.y && z==p.z);
                                            	}
                                            
                                            };
                                            
                                            class pa4{
                                            	public:
                                            	int x;
                                            	int y,z,w;
                                            	pa4(int x=0,int y=0,int z=0,int w=0):x(x),y(y),z(z),w(w) {}
                                            	bool operator < (const pa4 &p) const{
                                            		if(x!=p.x) return x<p.x;
                                            		if(y!=p.y) return y<p.y;
                                            		if(z!=p.z)return z<p.z;
                                            		return w<p.w;
                                            		//return x != p.x ? x<p.x: y<p.y;
                                            	}
                                            	bool operator > (const pa4 &p) const{
                                            		if(x!=p.x) return x>p.x;
                                            		if(y!=p.y) return y>p.y;
                                            		if(z!=p.z)return z>p.z;
                                            		return w>p.w;
                                            		//return x != p.x ? x<p.x: y<p.y;
                                            	}
                                            	bool operator == (const pa4 &p) const{
                                            		return x==p.x && y==p.y && z==p.z &&w==p.w;
                                            	}
                                            		
                                            
                                            };
                                            class pa2{
                                            	public:
                                            	int x,y;
                                            	pa2(int x=0,int y=0):x(x),y(y) {}
                                            	pa2 operator + (pa2 p) {return pa2(x+p.x,y+p.y);}
                                            	pa2 operator - (pa2 p) {return pa2(x-p.x,y-p.y);}
                                            	bool operator < (const pa2 &p) const{
                                            		return y != p.y ? y<p.y: x<p.x;
                                            	}
                                            	bool operator > (const pa2 &p) const{
                                            		return x != p.x ? x<p.x: y<p.y;
                                            	}
                                            	bool operator == (const pa2 &p) const{
                                            		return abs(x-p.x)==0 && abs(y-p.y)==0;
                                            	}
                                            	bool operator != (const pa2 &p) const{
                                            		return !(abs(x-p.x)==0 && abs(y-p.y)==0);
                                            	}
                                            		
                                            
                                            };
                                            

                                            class Point{
                                            	public:
                                            	double x,y;
                                            	Point(double x=0,double y=0):x(x),y(y) {}
                                            	Point operator + (Point p) {return Point(x+p.x,y+p.y);}
                                            	Point operator - (Point p) {return Point(x-p.x,y-p.y);}
                                            	Point operator * (double a) {return Point(x*a,y*a);}
                                            	Point operator / (double a) {return Point(x/a,y/a);}
                                            	double absv() {return sqrt(norm());}
                                            	double norm() {return x*x+y*y;}
                                            	bool operator < (const Point &p) const{
                                            		return x != p.x ? x<p.x: y<p.y;
                                            	}
                                            	bool operator == (const Point &p) const{
                                            		return fabs(x-p.x)<EPS && fabs(y-p.y)<EPS;
                                            	}
                                            };
                                            typedef Point Vector;
                                     #define pl pair<int,pas>
                                            struct Segment{
                                            Point p1,p2;
                                            };
                                             double dot(Vector a,Vector b){
                                            	return a.x*b.x+a.y*b.y;
                                            }
                                            double cross(Vector a,Vector b){
                                            	return a.x*b.y-a.y*b.x;
                                            }
                                        
                bool parareru(Point a,Point b,Point c,Point d){
                //	if(abs(cross(a-b,d-c))<EPS)cout<<"dd "<<cross(a-b,d-c)<<endl;
                	return abs(cross(a-b,d-c))<EPS;
                }
                double distance_ls_p(Point a, Point b, Point c) {
                  if ( dot(b-a, c-a) < EPS ) return (c-a).absv();
                  if ( dot(a-b, c-b) < EPS ) return (c-b).absv();
                  return abs(cross(b-a, c-a)) / (b-a).absv();
                }
                bool is_intersected_ls(Segment a,Segment b) {
                	if(a.p1==b.p1||a.p2==b.p1||a.p1==b.p2||a.p2==b.p2) return false;
                	if(parareru((a.p2),(a.p1),(a.p1),(b.p2))&&parareru((a.p2),(a.p1),(a.p1),(b.p1))){
                //		cout<<"sss"<<endl;
                		if(dot(a.p1-b.p1,a.p1-b.p2)<EPS) return true;
                		if(dot(a.p2-b.p1,a.p2-b.p2)<EPS) return true;
                		if(dot(a.p1-b.p1,a.p2-b.p1)<EPS) return true;
                		if(dot(a.p1-b.p2,a.p2-b.p2)<EPS) return true;
                		return false;
                	}
                  else return ( cross(a.p2-a.p1, b.p1-a.p1) * cross(a.p2-a.p1, b.p2-a.p1) < EPS ) && ( cross(b.p2-b.p1, a.p1-b.p1) * cross(b.p2-b.p1, a.p2-b.p1) < EPS );
                }
                 
                double segment_dis(Segment a,Segment b){
                	if(is_intersected_ls(a,b))return 0;
                	double r=distance_ls_p(a.p1, a.p2, b.p1);
                	r=min(r,distance_ls_p(a.p1, a.p2, b.p2));
                	r=min(r,distance_ls_p(b.p1, b.p2, a.p2));
                	r=min(r,distance_ls_p(b.p1, b.p2, a.p1));
                	return r;
                }
                Point intersection_ls(Segment a, Segment b) {
                  Point ba = b.p2-b.p1;
                  double d1 = abs(cross(ba, a.p1-b.p1));
                  double d2 = abs(cross(ba, a.p2-b.p1));
                  double t = d1 / (d1 + d2);
                 
                  return a.p1 + (a.p2-a.p1) * t;
                }
                
                                string itos( int i ) {
                                ostringstream s ;
                                s << i ;
                                return s.str() ;
                                }
                                 
                                int gcd(int v,int b){
                                	if(v>b) return gcd(b,v);
                                	if(v==b) return b;
                                	if(b%v==0) return v;
                                	return gcd(v,b%v);
                                }
                 
                                double distans(double x1,double y1,double x2,double y2){
                                	double rr=(x1-x2)*(x1-x2)+(y1-y2)*(y1-y2);
                                	return sqrt(rr);
                                	
                                }
                                int mod;
int extgcd(int a, int b, int &x, int &y) {
    if (b == 0) {
        x = 1;
        y = 0;
        return a;
    }
    int d = extgcd(b, a%b, y, x);
    y -= a/b * x;
    return d;
}
pa operator+(const pa & l,const pa & r) {   
    return {l.first+r.first,l.second+r.second};                                    
}    
                                
                int pr[1200010];
                int inv[1200010];
                
                int beki(int wa,int rr,int warukazu){
                	if(rr==0) return 1%warukazu;
                	if(rr==1) return wa%warukazu;
                	wa%=warukazu;
                	if(rr%2==1) return ((ll)beki(wa,rr-1,warukazu)*(ll)wa)%warukazu;
                	ll zx=beki(wa,rr/2,warukazu);
                	return (zx*zx)%warukazu;
                }
    double bekid(double w,int r){
    	if(r==0) return 1.0;
    	if(r==1) return w;
    	if(r%2) return bekid(w,r-1)*w;
    	double f=bekid(w,r/2);
    	return f*f;
    }
                
    			int comb(int nn,int rr){
    				int r=pr[nn]*inv[rr];
    				r%=mod;
    				r*=inv[nn-rr];
    				r%=mod;
    				return r;
    			}
                
                void gya(int ert){
                	pr[0]=1;
                	for(int i=1;i<=ert;i++){
                		pr[i]=(pr[i-1]*i)%mod;
                	}
                	for(int i=0;i<=ert;i++) inv[i]=beki(pr[i],mod-2,mod);
                	
                }
                
              //   cin.tie(0);
    		//	ios::sync_with_stdio(false);
    			//priority_queue<pa3,vector<pa3>,greater<pa3>> pq;            
                 //sort(ve.begin(),ve.end(),greater<int>());
    
       
       
                               //----------------kokomade tenpure------------

int n;
int a[100020];
int b[100020];

int haba=0;
int mi=0;
int M=0,m=0;
string s;
bool ch(){

	vector<pa> ve0,ve1;
	set<pa> se1,se0;
	for(int i=0;i<n;i++){
		
		
		if(b[i]==0){
			if(ve0.size()==0) ve0.pb({i,i+1});
			else if(ve0.back().second==i) ve0.back().second++;
			else ve0.pb({i,i+1});
			if(i==0) ve0.back().first=-inf;
			if(i==n-1) ve0.back().second=inf;
		}
		
		else{
			if(ve1.size()==0) ve1.pb({i,i+1});
			else if(ve1.back().second==i) ve1.back().second++;
			else ve1.pb({i,i+1});
			if(i==0) ve1.back().first=-inf;
			if(i==n-1) ve1.back().second=inf;
		}
		
	}
	
	priority_queue<pa3,vector<pa3>,greater<pa3>>pq0,pq1;
	for(auto v:ve0){
		se0.insert(v);
			pq0.push({v.second-v.first,v.first,v.second});
	}
	for(auto v:ve1){
		se1.insert(v);
			pq1.push({v.second-v.first,v.first,v.second});
	}
	
	int ad1=0,ad0=0;
	
	for(int i=0;i<n-1;i++){
		if(s[i]=='M'){
			ad1++;
			ad0--;
			
			while(pq0.size()){
				pa3 z=pq0.top();
				
				pa z2={z.y,z.z};
				if(se0.count(z2)==0){
					pq0.pop();
					continue;
				}
				
				if(z.x+ad0>0) break;
				
				pq0.pop();
				se0.erase(z2);
				auto it=se1.upper_bound(z2);
				it--;
				int l=(*it).first;
				it=se1.erase(it);
				int r=(*it).second;
				se1.erase(it);
				se1.insert({l,r});
				pq1.push({r-l,l,r});
			}
			
		}
		if(s[i]=='m'){
			ad1--;
			ad0++;
			
			while(pq1.size()){
				pa3 z=pq1.top();
				
				pa z2={z.y,z.z};
				if(se1.count(z2)==0){
					pq1.pop();
					continue;
				}
				
				if(z.x+ad1>0) break;
				pq1.pop();
				se1.erase(z2);
				auto it=se0.upper_bound(z2);
				it--;
				int l=(*it).first;
				it=se0.erase(it);
				int r=(*it).second;
				se0.erase(it);
				se0.insert({l,r});
				pq0.push({r-l,l,r});
			}
			
		}
		
	}
	/*
	cout<<"zero"<<endl;
	for(auto it=se0.begin();it!=se0.end();it++){
		cout<<(*it).first<<" "<<(*it).second-1<<endl;
	}
	cout<<endl;
	cout<<"one"<<endl;
	for(auto it=se1.begin();it!=se1.end();it++){
		cout<<(*it).first<<" "<<(*it).second-1<<endl;
	}
	cout<<endl;
	*/
	
	bool bo=0;
	for(auto it=se1.begin();it!=se1.end();it++){
		pa v=*it;
		v.second--;
		int len=-v.first+v.second+1;
		
		if(len+mi<=0) continue;
		
		int lef=v.first-M;
		int rig=v.second-m;
	//	cout<<lef<<" "<<rig<<endl;
		if(lef<=0 && 0<=rig)bo=1;
	}
	//cout<<bo<<endl;
	
	return bo;
	//return bo;
}

 signed main(){
 	

    	       cin.tie(0);
   			ios::sync_with_stdio(false);
cin>>n;
 	for(int i=0;i<n;i++)cin>>a[i];
 	
 	cin>>s;
 	
 	for(auto c:s){
 		if(c=='M')haba++,M++;
 		else haba--,m++;
 		mi=min(mi,haba);
 	}
 	
 	int si=0,ue=200020,me;
 	
 	while(ue-si>1){
 		int me=(ue+si)/2;
 	//	me=3;
 //		cout<<"== "<<me<<" =="<<endl;
 		for(int i=0;i<n;i++){
 			if(a[i]>=me)b[i]=1;
 			else b[i]=0;
 	//		cout<<b[i];
 			
 		}
 //		cout<<endl;
 		if(!ch())ue=me;
 		else si=me;
 	//	return 0;
 	}
 	cout<<ue-1<<endl;
 	return 0;
  }



Measured memory_bytes: 8412