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  1. import locale
  2. locale.setlocale(locale.LC_ALL,'')
  3. while 1:
  4.     A=[*map(float,input().split())]
  5.     if A[0]==-1:break
  6.     s=int(A[3])
  7.     del A[3]
  8.     k=3
  9.     print('Month ' + str(s) + ' cost: $', end="")
  10.     while 1:
  11.         if s-1<=2:
  12.             print(locale.format('%.2f',A[s-1],1));break
  13.         else:
  14.             A.append(round(A[k-3]*A[k-2]/A[k-1],2))
  15.             if s-1==k:
  16.                 print(locale.format('%.2f',A[k],1));break
  17.             else:k+=1
Success #stdin #stdout 0.04s 28040KB
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stdin
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5.23 5.50 5.52 4
5.23 5.50 5.52 2
2177.58 2713.7 433.11 1
2177.58 2713.7 433.11 2
2177.58 2713.7 433.11 3
1.00 1.00 300.00 4
2730.09 857.91 1657.49 23
1848.88 834.74 883.96 8
2139.59 1673.18 789.1 92
842.52 754.73 546.37 12
1661.62 583.08 2523.7 21
2323.23 446.56 1063.87 13
1609.55 2688.56 2446.8 6
1412.92 1182.61 1684.15 8
1474.11 1717.61 1474.11 34
685.29 2890.05 1655.34 54
2337.99 2490.45 618.13 11
1828.85 2307.46 892.15 20
1827.48 1325.26 1379.61 6
1952.23 2778.66 1247.81 84
551.16 780.3 2581.95 8
1652.54 2998.47 595.65 58
2117.78 1434.75 2304.84 81
308.16 2750.43 827.52 51
1583.25 172.82 1244.89 24
-1
stdout
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Month 4 cost: $5.21
Month 2 cost: $5.50
Month 1 cost: $2,177.58
Month 2 cost: $2,713.70
Month 3 cost: $433.11
Month 4 cost: $0.00
Month 23 cost: $11.28
Month 8 cost: $7,637.98
Month 92 cost: $357,991,898.40
Month 12 cost: $6,580.54
Month 21 cost: $108,439.07
Month 13 cost: $21.42
Month 6 cost: $1,163.40
Month 8 cost: $698.31
Month 34 cost: $1,717.61
Month 54 cost: $0.01
Month 11 cost: $3.02
Month 20 cost: $1,475,522.79
Month 6 cost: $2,325.39
Month 84 cost: $542,457,751.68
Month 8 cost: $7.59
Month 58 cost: $495,509,353.86
Month 81 cost: $62,535.51
Month 51 cost: $227,603,337.36
Month 24 cost: $2,433.23
https://ideone.com/qg1x1a
language:
Python 3 (python  3.9.5)
created:
5 years ago
visibility:
public

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