#include<cstdio>
using namespace std;
int n,i,x;
struct nod
{
    int info;
    nod *urm;
}*p;
void insereaza(nod *&p,int x)
{
    if(p==0)
    {
        p=new nod;
        (*p).info=x;
        (*p).urm=0;
    }
    else
    {
        nod *t,*q;
        q=p;
        while(q->urm!=0)
            q=q->urm;
        t=new nod;
        t->info=x;
        t->urm=0;
        q->urm=t;
    }
}
int suma(nod *p)
{
    int s=0;
    while(p!=0)
    {
        s=s+p->info;
        p=p->urm;
    }
    return s;
}
int main()
{
    freopen("pointeri.in","r",stdin);
    freopen("pointeri.out","w",stdout);
    scanf("%d",&n);
    for(i=1;i<=n;i++)
    {
        scanf("%d",&x);
        insereaza(p,x);
    }
    printf("%d",suma(p));
    return 0;
}