#include<stdio.h>
int main(void)
{
    int n,i,a[20],m;
    while(scanf("%d",&n)!=EOF)
    {
         for(i=0;i<n;i++)
         {
             scanf("%d",&a[i]);
         }
         scanf("%d",&m);
         for(i=0;i<n;i++)
         {
             if(m==a[i])
             {
                 printf("%d",i);
                 break;
             }
         }
         if(i==n)
         printf("No");
         printf("\n");
    }
    return 0;
}

 

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