#include<stdio.h>
#include<stdlib.h>
int main(){
    int n,m,i,j,cross;
    int *a,*b;
    
    scanf("%d %d", &n, &m);
    a = (int*)malloc(n);
    b = (int*)malloc(n);
    
    for ( i = 0; i < n; i++){
        scanf("%d %d", &a[i], &b[i]);
    }
    
    cross = 0;
    
    for ( i = 0; i < n-1; i++){
        for (j = i+1; j < n; j++){
            if( a[j] < a[i] || b[i] < a[j]){
                if ( a[i]<b[j] || b[j] < b[i]){
                    cross +=1;
                }
            }
            else if ( a[j] > a[i] || b[i] > a[j]){
                if( a[i] > b[j] || b[j] > b[i]){
                    cross += 1;
                }
            }
        }
    }
    printf("%d", cross/2);
    
    return 0;
}