# [Cy](https://github.com/cyoce/Cy), <s>33</s> <s>31</s> 30 bytes (non-competing) <!-- language-all: lang-rb --> This is going for the function option (takes N, outputs `F(N)`) 0 1 :>i {1 - $&+ times} &if :< Ungolfed/explanation: 0 1 # first two fibs are 0, 1 :>i # read input as integer (let's call it N) { 1 - {&+} # add the last two values times # repeat N-1 times ^ } &if # if N is non-zero ^ :< # output the last calculated value (if N is 0, that would be 0)