a = 1b = 1c = 0print(a)print(b)for i in range(1, 20): b = a a = a + b print(a)
Standard input is empty
1 1 2 4 8 16 32 64 128 256 512 1024 2048 4096 8192 16384 32768 65536 131072 262144 524288
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