import java.util.*;
import java.lang.*;
import java.io.*;

public class Main {
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		// 入力
		FastScanner sc = new FastScanner(System.in);
		long[] A = new long[5];
		for(int i = 0; i < 5; i++){
			A[i] = sc.nextLong();
		}
		
		// フィボナッチ数列作成
		long[] fibo = new long[100];
		Arrays.fill(fibo,-1L);
		fibo[0] = 1L;
		fibo[1] = 1L;
		for(int i = 2; i < 100; i++){
			fibo[i] = fibo[i-1] + fibo[i-2];
			if(fibo[i] > 1000000000000000L){
				break;
			}
		}
		
		// 判定
		int count = 0;
		int startId = -1;
		long num = A[4];
		for(int j = 0; j < 100; j++){
			if(num == fibo[j]){
				startId = j;
				count++;
				break;
			}else if(num < fibo[j]){
				break;
			}
		}
		
		//System.out.println(startId);
		if(startId != -1){
			int id = startId + 1;
			for(int i = 3; i >= 0; i--){
				//System.out.println("A=" + A[i] + " fibo=" + fibo[id]);
				if(A[i] == fibo[id]){
					count++;
					id++;
				}else{
					break;
				}
			}
		}
		
		if(startId == 0){
			startId = 1;
			int id = startId + 1;
			int count2 = 1;
			for(int i = 3; i >= 0; i--){
				if(A[i] == fibo[id]){
					count2++;
					id++;
				}else{
					break;
				}
			}
			//System.out.println(count);
			//System.out.println(count2);
			if(count < count2){
				count = count2;
			}
		}
		
		// 出力
		System.out.println(count);
	}
	
	// 高速スキャナー
    static class FastScanner {
        private BufferedReader reader = null;
        private StringTokenizer tokenizer = null;

        public FastScanner(InputStream in) {
            reader = new BufferedReader(new InputStreamReader(in));
            tokenizer = null;
        }

        public String next() {
            if (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public String nextLine() {
            if (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    return reader.readLine();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }

            return tokenizer.nextToken("\n");
        }

        public long nextLong() {
            return Long.parseLong(next());
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

        public double nextDouble() {
             return Double.parseDouble(next());
         }

        public int[] nextIntArray(int n) {
            int[] a = new int[n];
            for (int i = 0; i < n; i++)
                a[i] = nextInt();
            return a;
        }

        public long[] nextLongArray(int n) {
            long[] a = new long[n];
            for (int i = 0; i < n; i++)
                a[i] = nextLong();
            return a;
        } 
    }
}