N = int(input()) Count = 0 for i in range(1,N + 1): if (i < 100): Count += 1 elif (i < 1000): temp = str(i) a, b, c = temp[0], temp[1], temp[2] a, b, c = int(a),int(b),int(c) if a - b == b - c: Count += 1 else: pass print(Count)
C,C++,C#,Java,Unity
N = int(input()) Count = 0 for i in range(1,N + 1): if (i < 100): Count += 1 elif (i < 1000): temp = str(i) a, b, c = temp[0], temp[1], temp[2] a, b, c = int(a),int(b),int(c) if a - b == b - c: Count += 1 else: pass print(Count)
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