x=[]
count=0
list=[]
amo=0
x=[int(y) for y in input().split()]
for i in range(x[0]):
    if (i+1)*x[2]>x[3]:
        None
    elif (i+1)*x[2]>x[1]:
        None
    else:
        amo=i+1
print(str(amo))