def solve(x,y):
    retu=0
    if X>H*2**(x+x+y):
        retu=max(retu,solve(x+1,y)+1)
    if Y>H*2**(x+y+y):
        retu=max(retu,solve(x,y+1)+1)
    return retu

X,Y,H=map(int,input().split())
X*=1000
Y*=1000
ans=solve(0,0)
print(ans)