#幸福度-金額*しきい値>0

N,X,Y=map(int,input().split())
A=[tuple(map(int,input().split())) for i in range(N)]
sep=[]
for w,v,c in A:
    ns=[]
    for j in range(10):
        if c>=(1<<j):
            ns.append(1<<j)
            c-=1<<j
    if c:
        ns.append(c)
    sep.append(tuple(ns))
ok=0.0
ng=1000000000.0
for i in range(60):
    mid=(ok+ng)/2
    dp=[-100000000000000.0]*X
    dp[0]=0.0
    idx=0
    for w,v,c in A:
        for j in sep[idx]:
            nw=w*j
            nv=v*j
            ndp=[-100000000000000.0]*X
            for k in range(X):
                ndp[k]=max(ndp[k],dp[k])
                ndp[(k+nw)%X]=max(ndp[(k+nw)%X],dp[k]+nv+((k+nw)//X)*Y-nw*mid)
            dp=ndp
        idx+=1
    if max(dp)>0:
        ok=mid
    else:
        ng=mid
print(ok)