using System;

using System.Linq;

public class Program

{

    private const string Input =@"

    120847

60347

63340

72773

57020

133960

98163

121548

87233

59150

59712

146816

93205

61936

75319

141998

97125

73450

106250

129939

94854

113782

112044

127923

67114

119770

130034

70876

82204

101939

132604

142836

117066

95861

75597

94630

50085

101107

77937

94286

74091

140875

118543

52767

54544

93062

115681

142065

111737

131214

75160

115432

140504

115376

86589

104631

133012

108690

85993

99533

133725

87698

133480

68379

107852

111209

116623

98717

130227

114356

144516

89663

118355

77816

149914

105080

116793

65259

143900

67838

148389

129753

140524

90005

147305

118428

79940

59110

78120

87066

64722

142066

81410

106958

92984

95584

108534

66362

126340

143660

​

    ";

    public static void Main()

    {

        var result = Input.Split('\n')

            .Select(s => s.Trim())

            .Where(s => !string.IsNullOrEmpty(s))

            .Select(s=>int.Parse(s))

            .Select(i=>CalculateFuel(i) )

            .Sum();

        Console.WriteLine(result);

    }

    private static int CalculateFuel(int mass) 

    {

        var fuel = (mass/3)-2;

        return fuel <= 0 ? 0 : CalculateFuel(fuel) + fuel;

    }

}