B - Searching

//https://codeforces.com/group/MWSDmqGsZm/contest/219774/problem/B
#include<stdio.h>
int main(){
long long int n,c=-1,find,i;
scanf("%lld",&n);
long long int inp[n];
for(i=0;i<n;i++){
    scanf("%lld",&inp[i]);
}
scanf("%lld",&find);
for(i=0;i<n;i++){
    if(inp[i]==find){
            c=i;
       if(c>=0) break;
    }
}
printf("%lld",c);

return 0;
}