solution:
n=int(input())
for i in range(1,n+1):
st=input()
c=[int(s) for s in st.split(" ")]
d=int(input())
k=int(input())
(sum,n)=(0,1)
an=0
while(True):
sum+=n*d
if(sum>=k):
for j in range(1,len(c)):
an+=c[j]*(n**(j-1))
print(an)
break
n+=1
This post is contributed by
G. Rama Krishna Srinivas, M.Tech
Asst.Prof, KLUniversity.
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