#include <cstdio>
#include <cmath>
int const MAX = 1005;
double const EPS = 1e-10;
double p[3][MAX][MAX], dp[MAX][MAX];

int main()
{
    int r, c;
    double p1, p2, p3;
    while(scanf("%d %d", &r, &c) != EOF)
    {
        for(int i = 1; i <= r; i++)
            for(int j = 1; j <= c; j++)
                scanf("%lf %lf %lf", &p[0][i][j], &p[1][i][j], &p[2][i][j]);
        dp[r][c] = 0;
        for(int i = r; i >= 1; i--)
            for(int j = c; j >= 1; j--)
                if(!(i == r && j == c))
                    if(fabs(p[0][i][j] - 1.0) < EPS)
                        dp[i][j] = 0;
                    else 
                        dp[i][j] = (dp[i][j + 1] * p[1][i][j] + dp[i + 1][j] * p[2][i][j] + 2) / (1.0 - p[0][i][j]);
        printf("%.3f\n", dp[1][1]);
    }
}