# your code goes here
from collections  import deque
 
FILE = "test"
try:
    inFile = open(FILE+".txt")
except:
    pass
 
 
def read():
    try:
        return inFile.readline().strip()
    except:
        return input().strip()
 
def bfs(f, s, g, u ,d):
    visited = {}
    path = {}
 
 
    q =deque(maxlen=None)
    q.append(s)
    visited[s] = True
    found = False
 
    while q:
        track = q.popleft()
 
        action_up = track + u
        action_down = track - d
 
        if (not action_up in visited) and (1 <= action_up <= f) :
            visited[action_up] = True
            path[action_up] = track
            q.append(action_up)
 
        if  (not action_down in visited) and (1 <= action_down <= f):
            visited[action_down ] = True
            path[action_down ] = track
            q.append(action_down)
 
        if action_down == g or action_up == g:
            found = True
            q.clear()
 
    visited.clear()
 
    count = 0
    u1 = g
 
    if found == True:
        while 1:
 
            u1 = path[u1]
            count = count +1
 
            if u1==s:
                break
 
        print(count)
    else:
        print('use the stairs')
 
 
#1 <= s, g <= f <= 1000000 and 0 <= u, d <= 1000000
f, s, g, u ,d = map(int,read().split())
 
 
if s == g:
    print('0')
elif s > g and d == 0: #This case Source > Des and down = 0 No way for coming down.
    print('use the stairs')
elif s < g and u == 0 : #This case Source < Des and up = 0 No way for coming up.
    print('use the stairs')
else:
    bfs(f, s, g, u ,d)

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MTAwMDAwMCAxIDEwMDAwMDAgMSAx

1000000 1 1000000 1 1