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#include<bits/stdc++.h>
using namespace std;
int main(){
int a,b,c,d,e,f;
cin>>a>>b>>c>>d>>e>>f;
int x=a+b;
int y=c+d;
int z=e+f;
if(x<=y && x<=z){
cout<<x;
}else if(y<=x && y<=z){
cout<<y;
}else if(z<=x && z<=y){
cout<<z;
}
return 0;
}