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#include <iostream>
using namespace std;


int main()
{
	int n, c = 0;
	cin >> n;
	int *numb = new int[n];
	for (int i = 0; i<n; i++) {
		cin >> numb[i];
	}
	int i = 0;
	while (i<(n-1)) {
		if (numb[i]>numb[i + 1]) {
			numb[i + 1]=numb[i + 1] * 10;
			c++;
		}else{
			i++;
		}
	}
	cout << c;
	return 0;
}