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#include <iostream>
#include <vector>
using namespace std;

int main()
{
    int n;
    cin >> n;
    vector<int> arr(n);
    for (int i = 0; i < n; i++)
        cin >> arr[i];

    for (int i = 0; i < n; i++)
    {
        int min = i;
        for (int j = i + 1; j < n; j++)
        {
            if (arr[j] < arr[min])
                min = j;
        }
       // swap(arr[i], arr[min]);
        int temp=arr[i];
        arr[i]=arr[min];
        arr[min]=temp;
    }

    for (int i = 1; i <= n; i++)
    {
        if (arr[i - 1] != i)
        {
            cout << "No" << endl;
            return 0;
        }
    }
    cout << "Yes" << endl;
    return 0;
}

// prf