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import java.util.*;
class Main{
    public static void main(String[] args){
        Scanner in=new Scanner(System.in);
        int n=in.nextInt();
        int[] num=new int[n];
        for(int i=0;i<n;i++){
            num[i]=in.nextInt();
        }
        for(int i=1;i<n;i++){
            if(num[i]>0){
                System.out.println(i);
                return ;
            }
        }
        System.out.println(-1);
        return ;
    }
}
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