#include<bits/stdc++.h>
using namespace std;
long long n,a,b,c;
int main()
{
    cin>>n;
    for (int i=1;i<=n;i++)
{
    	cin>>a;
    	if (b!=a)c++;
    	b=a;
}
    cout<<c;
}

#include<bits/stdc++.h> using namespace std; int ans; double s=2,n,y; int main() { cin>>n; while(y<n) { y=y+s; ans++; s=s*0.98; } cout<<ans; }

#include <iostream>
#include <cmath>
#include <algorithm>

using namespace std;

int main() {
    int Y1, Y2, T1, T2, T;
    cin >> Y1 >> Y2 >> T1 >> T2 >> T;
    
    // 计算赋分
    double Y = Y1 + (double)(Y2 - Y1) * (T - T1) / (T2 - T1);
    
    // 四舍五入
    int result = round(Y);
    
    // 确保结果在Y1和Y2之间（虽然题目保证输入合法）
    result = max(Y1, min(Y2, result));
    
    cout << result << endl;
    
    return 0;
}