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22 lines
353 B
C#
22 lines
353 B
C#
using System;
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namespace problem_691A
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{
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class problem_691A
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{
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public static void Main(string[] args)
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{
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Console.ReadLine();
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string s = Console.ReadLine();
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if ((s.IndexOf('0') == s.LastIndexOf('0') && s.Contains("0") && s.Contains("1")) || s == "1")
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{
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Console.Write("YES");
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}
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else
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{
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Console.Write("NO");
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}
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}
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}
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}
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