a=input().split()
x=int(a[0])
y=int(a[1])
o=int(a[2])
z=1/o
n=int(a[3])
m=int(a[4])
p=0
for i in range(m):
    for j in range(m-i):
        if m-i-j<0:
            
            k=m-i-j
            if k>=0:
                if k%o==0:
                    
                    if x*i+y*j+k*z==n:
                        p+=1

print(p)