Dice Combinations

import sys
from collections import deque

MOD = 10**9 + 7
n = int(sys.stdin.readline())
last = deque([1])
window_sum = 1        
ans = 0

for x in range(1, n + 1):
    ans = window_sum % MOD         
    last.append(ans)               
    window_sum = (window_sum + ans) % MOD

    if len(last) > 6:               
        removed = last.popleft()
        window_sum = (window_sum - removed) % MOD

print(ans % MOD)

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: ACCEPTED