344A

#include <stdio.h>
int main()
{int a, b;int n;scanf("%d", &n);scanf("%d", &a);int Count=1;int i;for(i=0; i<n-1; ++i){scanf("%d", &b);if((a%10)==(b/10))++Count;a=b;}printf("%d\n", Count);return 0;
}