using System.Collections.Generic;
public static void Main()
Dictionary<string, int> fruitsCount = new Dictionary<string, int>();
fruitsCount["banana"] = 5;
fruitsCount["apple"] = 3;
fruitsCount["orange"] = 3;
fruitsCount["peach"] = 4;
Console.WriteLine(fruitsCount.ContainsKey("banana"));
Console.WriteLine(fruitsCount.ContainsKey("tomato"));
Console.WriteLine(fruitsCount.ContainsValue(5));
Console.WriteLine(fruitsCount.ContainsValue(1));
Console.WriteLine(fruitsCount.Count);