#include<stdio.h>

int main(void){
	int n,m,d[64][64] = {0},i,j,k,l,r = 0;
	scanf("%d%d",&n,&m);
	for(i = 1;i <= m;i++){
		scanf("%d%d",&j,&k);
		d[j][k]=1;
	}
	for(i = 0;i < n;i++){
		for(j = i+1;j < n;j++){
			for(k = j+1;k < n;k++){
				for(l = k+1;l < n;l++){
					if(d[i][j] && d[j][k] && d[k][l] && d[i][l] && !(d[i][k]) && !(d[j][l])){r++;}
				}
			}
		}
	}
	printf("%d\n",r);
	return 0;
}