#include
void main()
{
int n,ans,temp,c;
while(scanf(\"%d\",&n)!=EOF&&n)
scanf(\"%d\",&ans),c=1;
for(int i=2;i<=n;++i)
scanf(\"%d\",&temp);
c+=(temp==ans?1:-1);
if(!c)
scanf(\"%d\",&ans),++i,c=1;
}
printf(\"%d\\n\",ans);
