#include<cstdio>

 #include<cctype>

 #include<algorithm>

 inline int getint() {

     register char ch;

     while(!isdigit(ch=getchar()));

     register int x=ch^'';

     while(isdigit(ch=getchar())) x=(((x<<)+x)<<)+(ch^'');

     return x;

 }

 int main() {

     int s[],ans=;

     for(register int i=;i<;i++) {

         s[i]=getint();

     }

     for(register int i=;i<;i++) {

         int tmp=;

         for(register int j=;j<;j++) {

             tmp+=s[(i+j)%];

         }

         ans=std::max(ans,tmp);

     }

     printf("%d\n",ans);

     return ;

 }