mod = 998244353


def main():
    import sys
    input = sys.stdin.readline

    N, M = map(int, input().split())
    V = list(map(int, input().split()))
    S = [[0] * M for _ in range(N)]
    for i in range(N):
        T = input().rstrip('\n')
        for j in range(M):
            if T[j] == "o":
                S[i][j] = V[i]

    ans = 0
    for _ in range(M):
        C = [0] * M
        for i in range(N):
            for j in range(M):
                C[j] += S[i][j]
        j_max = C.index(max(C))
        ans += C[j_max] ** 2
        for i in range(N):
            if S[i][j_max]:
                for j in range(M):
                    S[i][j] = 0
    print(ans)


if __name__ == '__main__':
    main()