#include <iostream>
using namespace std;

const int SIZE=50;

void main()
{
	int arr[SIZE],i,j,input,counter2=0,index,temp_counter,temp_index;

	cout<<"please enter natural numbers";
	i=0;
	do
	{
		cin>>input;
	}
	while (input != -1)
	{
		arr[i]=input;
		i++;
	}

	for (j=0; j<i; j++)
	{
		if (arr[j]>=arr[j+1])
		{
			counter2++;
			index=j;
		}
	temp_counter=counter2;
	temp_index=index;
	}

	cout<<"the index is" << temp_index<< endl;
}