import std.conv, std.functional, std.range, std.stdio, std.string; import std.algorithm, std.array, std.bigint, std.bitmanip, std.complex, std.container, std.math, std.mathspecial, std.numeric, std.regex, std.typecons; import core.bitop; class EOFException : Throwable { this() { super("EOF"); } } string[] tokens; string readToken() { for (; tokens.empty; ) { if (stdin.eof) { throw new EOFException; } tokens = readln.split; } auto token = tokens.front; tokens.popFront; return token; } int readInt() { return readToken.to!int; } long readLong() { return readToken.to!long; } real readReal() { return readToken.to!real; } bool chmin(T)(ref T t, in T f) { if (t > f) { t = f; return true; } else { return false; } } bool chmax(T)(ref T t, in T f) { if (t < f) { t = f; return true; } else { return false; } } int binarySearch(alias pred, T)(in T[] as) { int lo = -1, hi = cast(int)(as.length); for (; lo + 1 < hi; ) { const mid = (lo + hi) >> 1; (unaryFun!pred(as[mid]) ? hi : lo) = mid; } return hi; } int lowerBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a >= val)); } int upperBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a > val)); } void main() { enum L = 100; auto fib = new BigInt[L]; fib[0] = 1; fib[1] = 1; foreach (l; 2 .. L) { fib[l] = fib[l - 1] + fib[l - 2]; } try { for (; ; ) { enum N = 5; auto A = new BigInt[N]; foreach (i; 0 .. N) { A[i] = readLong(); } int ans; foreach (k; 1 .. N + 1) { foreach (l; 0 .. L - k) { bool ok = true; foreach (i; 0 .. k) { ok = ok && (fib[l + i] == A[N - 1 - i]); } if (ok) { chmax(ans, k); } } } writeln(ans); } } catch (EOFException e) { } }