R=range
J=lambda:map(int,input().split())
N,M=J()
A=[list(J())for n in R(N)]
A=sorted([(1/a[0]-1/a[1])/a[2],1/a[0],1/a[1],1/a[2]]for a in A)
X=[[0,0]for i in R(M+1)]
X[0][1]=1
for a in A:
	X[M][0]+=X[M][1]*a[1]
	for i in R(M-1,-1,-1):
		p=X[i][1]*pow(1-a[3],M-i)
		X[M]=[X[M][0]+p*a[1],X[M][1]+p]
		for j in R(M-1,i,-1):
			p=X[i][1]*pow(1-a[3],j-i)*a[3]
			X[j]=[X[j][0]+p*a[2],X[j][1]+p]
		X[i]=[X[i][0]+X[i][1]*a[3]*a[2],X[i][1]*a[3]]
print(sum(x[0]for x in X))