import std.algorithm;
import std.array;
import std.conv;
import std.math;
import std.range;
import std.stdio;
import std.string;
import std.typecons;

T read(T)() { return readln.chomp.to!T; }
T[] reads(T)() { return readln.split.to!(T[]); }
alias readint = read!int;
alias readints = reads!int;

/// n 番目のフィボナッチ数を求める
/// F(0) = 0, F(1] = 1, F(2) = 1, F(3) = 2, F(4) = 3
int fib(int n) {
    if (n == 0) return 0;

    auto mat = new Mat2x2([[1, 1], [1, 0]]);
    auto m = mat.pow(n, int.max);
    return m.get(0, 1);
}

void main() {
    int n = readint;
    // 問題文の定義だとF(0) = 1, F(1) = 1 なので値を 1 だけずらす
    writeln(fib(n + 1));
}

class Mat2x2 {
    private const N = 2;
    private const int[][] _mat;

    this(const int[][] init) {
        assert(init.length == N);
        assert(init[0].length == init[1].length && init[0].length == N);

        _mat = init.dup;
    }

    int get(int r, int c) const {
        return _mat[r][c];
    }

    Mat2x2 mul(const Mat2x2 m, int mod) const {
        auto t = new int[][](N, N);

        for (int i = 0; i < N; i++) {
            for (int j = 0; j < N; j++) {
                int x = 0;
                for (int k = 0; k < N; k++) {
                    x = (x + (_mat[i][k] * m.get(k, j)) % mod) % mod;
                }
                t[i][j] = x;
            }
        }
        return new Mat2x2(t);
    }

    Mat2x2 copy() const {
        return new Mat2x2(_mat);
    }

    Mat2x2 pow(int k, int mod) const {
        assert(k > 0);
        if (k == 1) return this.copy();

        auto m = this.pow(k / 2, mod);
        return k % 2 == 0
            ? m.mul(m, mod)
            : this.mul(m.mul(m, mod), mod);
    }

    void dump() const {
        writeln(_mat[0][0], " ", _mat[0][1]);
        writeln(_mat[1][0], " ", _mat[1][1]);
    }
}

