#include<bits/stdc++.h>
using namespace std;
int n,a[10000],sum,zz=1;
int main()
{
	cin>>n;sum=n;
	for(int i=1;i<=10000;i++)
	{
		cin>>a[i];		
		if(a[i]<n) sum+=a[i];
		else break;
	}
	cout<<sum;
}