n=list(map(int,input().split()))
a=n[0]
b=n[1]
c=n[2]
d=n[3]
cnt=0
for i in range(n[0]):
    a-=1
    b-=c
    d-=(c+1)
    if(a>=0 and b>=0 and c>=0):
        cnt+=1
    else:
        break
    

print(cnt)