MOD = 10 ** 9 + 7
INF = 10 ** 10
import sys
sys.setrecursionlimit(100000000)
dy = (-1,0,1,0)
dx = (0,1,0,-1)

def main():
    x,y,h = map(int,input().split())
    x *= 1000
    y *= 1000
    ans = 0
    while x > h or y > h:
        if h < x and h < y:
            if x < y:
                y *= 2
                h *= 4
                ans += 1
            else:
                x *= 2
                h *= 4
                ans += 1

        elif h < x:
            y *= 2
            h *= 4
            ans += 1
        
        elif h < y:
            x *= 2
            h *= 4
            ans += 1
        
    print(ans)
    
if __name__ =='__main__':
    main()