#include <stdio.h>
#include <stdlib.h>
int main()
{
    int N, *a, i, result;
    printf("Enter N (N>0): \n");
    scanf("%d", &N);
    if (N <= 0 || N == 1)
    {
        printf("Incorrect input data.");
        return -1;
    }
    a = (int*) malloc (N*sizeof(int));
    printf("\nEnter N elements: \n");
    for (i=0; i<N; i++)
    {
        scanf("%d", &a[i]);
    }
    for (i=1; i<N; i++)
    {
        if (a[i] < a[i-1])
        {
            result = 0;
        }
        else
        {
            result = i-1;
            break;
        }
    }
    printf("\nResult: %d.\n", result);
    return 0;
}