#include<bits/stdc++.h>
using namespace std;
typedef __int128 LL;
inline void print(LL x){
    if(x>=10) print(x/10);
    putchar(x%10+'0');
}
template<typename T>inline void readmain(T&x){x=0;char ch;int f=1;while(!isdigit(ch=getchar()))if(ch=='-')f=-1;do x=x*10+(ch^48);while(isdigit(ch=getchar()));x*=f;}
template<typename T> inline void read(T&x){readmain(x);}
template<typename T,typename ...Tr> inline void read(T&x,Tr&...r){readmain(x);read(r...);}
int main(){
    int n;cin>>n;
    LL sum=0,x=0;
    for(int i=1;i<=n;i++) read(x),sum+=x;
    while((sum&-sum)!=sum) sum-=sum&-sum;
    print(sum);
}