#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-8)
                                          
    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);
                                            	}
                                            		
                                            
                                            };
                                            
 
                      
                                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);
                                }
                 
                            
                                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};                                    
}    
pa operator-(const pa & l,const pa & r) {   
    return {l.first-r.first,l.second-r.second};                                    
}  
                                
                int pr[1000010];
                int inv[1000010];
                
                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;
                }
 
                
    			int comb(int nn,int rr){
    				if(rr<0 || rr>nn || nn<0) return 0;
    				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;
                	}
                		inv[ert]=beki(pr[ert],mod-2,mod);
                	for(int i=ert-1;i>=0;i--){
                		inv[i]=inv[i+1]*(i+1)%mod;
                	}
                }
                
              //   cin.tie(0);
    		//	ios::sync_with_stdio(false);
    			//priority_queue<pa3,vector<pa3>,greater<pa3>> pq;            
                 //sort(ve.begin(),ve.end(),greater<int>());
 //   mt19937(clock_per_sec);
  //  mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count()) ;
      
       
       
                               //----------------kokomade tenpure------------


struct edge{
	int to,cap,num,moto;
};
vector<edge> ZANYO[100020];
int label[100020];
queue<pa> qu_bfs;
int dokomade[100020];
void add_edge(int s_point,int t_point, int capa){// (s!=t)  s-->t
	
		ZANYO[s_point].pb((edge){t_point,capa,(int)ZANYO[t_point].size(),0});
		ZANYO[t_point].pb((edge){s_point,0,(int)ZANYO[s_point].size()-1,1});
}

void bfs_dinic(int s_point,int N){
	for(int i=0;i<N;i++)label[i]=-1;
	while(qu_bfs.size())qu_bfs.pop();
	qu_bfs.push(mp(s_point,0));
	while(qu_bfs.size()){
		pa z=qu_bfs.front();
		qu_bfs.pop();
		if(label[z.first]>=0)continue;
		label[z.first]=z.second;
		for(auto &v:ZANYO[z.first]){
			if(v.cap==0) continue;
			if(v.cap<0){
				cout<<"error"<<endl;
				exit(0);
			}
			if(label[v.to]>=0) continue;
			
			qu_bfs.push(mp(v.to,z.second+1));
		}
	}
	return;
}

int dfs_dinic(int s_point,int t_point, int ima_flow){
	if(s_point==t_point) return ima_flow;
	while(1){
		if(dokomade[s_point]>=ZANYO[s_point].size()) break;
		int edanum=dokomade[s_point];
		if(ZANYO[s_point][edanum].cap<0){
			cout<<"minus"<<endl;
			exit(0);
		}
		if(ZANYO[s_point][edanum].cap<=0 || label[s_point]+1!=label[ZANYO[s_point][edanum].to] ){
			dokomade[s_point]++;
			continue;
		}
		int W=dfs_dinic(ZANYO[s_point][edanum].to,t_point,min(ZANYO[s_point][edanum].cap,ima_flow));
		if(W>0){
			ZANYO[s_point][edanum].cap-=W;
			ZANYO[ZANYO[s_point][edanum].to][ZANYO[s_point][edanum].num].cap+=W;
			return W;
		}
		dokomade[s_point]++;
	}
	return 0;
}

int max_flow_dinic(int s_point,int t_point,int N){// Nは頂点数:存在する頂点番号が[0,N) (Nは多めにしてOK)
	int jougen=inf*1000000000ll; //容量の最大値
	int ans_flow=0;
	while(1){
	
		bfs_dinic(s_point,N);
		if(label[t_point]==-1) break;
		for(int i=0;i<N;i++)dokomade[i]=0;
		while(1){
			int ima_flow=dfs_dinic(s_point,t_point,jougen+1); 
			if(ima_flow==0)break;
			ans_flow+=ima_flow;
		}
	}
	return ans_flow;
}


 signed main(){

   cin.tie(0);
	ios::sync_with_stdio(false);

 	int n;
 	cin>>n;
 	int E=0;
 	for(int i=1;i<=n;i++){
 		int y;
 		cin>>y;
 		y*=-1;
 		if(y>=0){
 			add_edge(0,i,0);
 			add_edge(i,n+1,y);
 			
 		}
 		else{
 			E-=y;
 			add_edge(0,i,-y);
 			add_edge(i,n+1,0);
 		}
 	}
 	for(int i=1;i<=n;i++){
 		for(int j=2*i;j<=n;j+=i)add_edge(j,i,inf*10000ll);
 	}
	
 	cout<< -max_flow_dinic(0,n+1,500)+E<<endl;
return 0;
 	
 
 }


Measured memory_bytes: 2816