#include <bits/stdc++.h>
using namespace std;
int g[5][150005];
long long dp[5][5][5][150005][5];
int n;
long long cal(int i,int j,int k){
bool a,b,c;
if((j&1)==1){a=true;}else{a=false;}
if((j&2)==2){b=true;}else{b=false;}
if((j&4)==4){c=true;}else{c=false;}
//cout<<j<<' '<<a<<b<<c<<endl;
if(k==0 && a){return 0;}
if(k==1 && b){return 0;}
if(k==2 && c){return 0;}
if(a && !b && !c){dp[1][0][0][i][0] = dp[1][0][0][i-1][0]+g[0][i];cout<<"100"<<' ';}
if(!a && b && !c){dp[0][1][0][i][1] = dp[0][1][0][i-1][1]+g[1][i];cout<<"010"<<' ';}
if(!a && !b && c){dp[0][0][1][i][2] = dp[0][0][1][i-1][2]+g[2][i];cout<<"001"<<' ';}
if(a && b && !c){dp[1][1][0][i][k] = max(dp[1][1][0][i-1][k]+g[k][i],max(dp[1][0][0][i-1][0]+g[1][i],dp[0][1][0][i-1][1]+g[0][i]));cout<<"110"<<' ';}
if(a && !b && c){dp[1][0][1][i][k] = max(dp[1][0][1][i-1][k]+g[k][i],max(dp[1][0][0][i-1][0]+g[2][i],dp[0][0][1][i-1][1]+g[0][i]));cout<<"101"<<' ';}
if(!a && b && c){dp[0][1][1][i][k] = max(dp[0][1][1][i-1][k]+g[k][i],max(dp[0][0][1][i-1][0]+g[1][i],dp[0][1][0][i-1][1]+g[2][i]));cout<<"011"<<' ';}
if(a && b && c){dp[1][1][1][i][k] = max(dp[1][1][1][i-1][k]+g[k][i] , max(dp[1][1][0][i-1][k]+g[2][i],max(dp[1][0][1][i-1][k]+g[1][i],dp[0][1][1][i-1][k]+g[0][i])));cout<<"111"<<endl;}
cout<<i<<' '<<j<<' '<<k<<' '<<dp[j&1][j&2][j&4][i][k]<<' '<<a<<b<<c<<endl;
return dp[j&1][j&2][j&4][i][k];
}
int solve(){
dp[1][0][0][0][2]=g[0][0];
dp[0][1][0][0][2]=g[1][0];
dp[0][0][1][0][2]=g[2][0];
for(int i = 1;i<n;i++){
for(int j = 0;j<8;j++){
for(int k = 0;k<3;k++){
dp[j&1][j&2][j&4][i][k]=cal(i,j,k);
}
}
}
return max(dp[0][0][0][n-1][0],max(dp[0][0][0][n-1][1],dp[0][0][0][n-1][2]));
}
int main() {
cin>>n;
for(int i = 0;i<3;i++){
for(int j = 0;j<n;j++){
cin>>g[i][j];
}
}
cout<<solve()<<endl;
return 0;
}
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