#include <stdio.h>
#include <sstream>
#include <iostream>
#include <fstream>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <stack>
#include <memory.h>
#include <queue>
#include <string>
#include <string.h>
#include <cmath>
#include <utility>
#include <bitset>
#include <time.h>
#include <climits>

#define PI 3.1415926535897932384626433832795
#define sqr(x) ((x)*(x))
#define OUT_RT cerr << (float(clock()) / CLOCKS_PER_SEC) << endl

typedef long long LL;
typedef unsigned long long ULL;

using namespace std;

int d[111111];

int main(){
    freopen("input.txt","r",stdin);
    freopen("output.txt","w",stdout);

    int n, m;
    LL ans = 0;

    cin >> n >> m;
    for(int i=0;i<n;i++){
    	string s;
    	int x = 0;

    	cin >> s;
    	for(int j=0;j<m;j++)
    		x = (x<<1) + (s[j] == '+');

		d[x]++;
    }

	int mm = 1 << m;
    for(int i=1; i<mm; ++i) {
		int c = d[0];
		for(int j = (i - 1) & i; j; j = (j - 1) & i) c += d[j];
		ans += (LL)c * d[i];
    }

    cout << ans << endl;

    return 0;
}