#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("inline")
#include<bits/stdc++.h>
using namespace std;
inline int my_getchar_unlocked(){
  static char buf[1048576];
  static int s = 1048576;
  static int e = 1048576;
  if(s == e && e == 1048576){
    e = fread_unlocked(buf, 1, 1048576, stdin);
    s = 0;
  }
  if(s == e){
    return EOF;
  }
  return buf[s++];
}
inline void rd(long long &x){
  int k;
  int m=0;
  x=0;
  for(;;){
    k = my_getchar_unlocked();
    if(k=='-'){
      m=1;
      break;
    }
    if('0'<=k&&k<='9'){
      x=k-'0';
      break;
    }
  }
  for(;;){
    k = my_getchar_unlocked();
    if(k<'0'||k>'9'){
      break;
    }
    x=x*10+k-'0';
  }
  if(m){
    x=-x;
  }
}
struct MY_WRITER{
  char buf[1048576];
  int s;
  int e;
  MY_WRITER(){
    s = 0;
    e = 1048576;
  }
  ~MY_WRITER(){
    if(s){
      fwrite_unlocked(buf, 1, s, stdout);
    }
  }
}
;
MY_WRITER MY_WRITER_VAR;
void my_putchar_unlocked(int a){
  if(MY_WRITER_VAR.s == MY_WRITER_VAR.e){
    fwrite_unlocked(MY_WRITER_VAR.buf, 1, MY_WRITER_VAR.s, stdout);
    MY_WRITER_VAR.s = 0;
  }
  MY_WRITER_VAR.buf[MY_WRITER_VAR.s++] = a;
}
template<class T> inline void wt_L(vector<T> x);
template<class T> inline void wt_L(set<T> x);
template<class T> inline void wt_L(multiset<T> x);
template<class T1, class T2> inline void wt_L(pair<T1,T2> x);
inline void wt_L(char a){
  my_putchar_unlocked(a);
}
inline void wt_L(int x){
  int s=0;
  int m=0;
  char f[10];
  if(x<0){
    m=1;
    x=-x;
  }
  while(x){
    f[s++]=x%10;
    x/=10;
  }
  if(!s){
    f[s++]=0;
  }
  if(m){
    my_putchar_unlocked('-');
  }
  while(s--){
    my_putchar_unlocked(f[s]+'0');
  }
}
inline void wt_L(unsigned x){
  int s=0;
  char f[10];
  while(x){
    f[s++]=x%10;
    x/=10;
  }
  if(!s){
    f[s++]=0;
  }
  while(s--){
    my_putchar_unlocked(f[s]+'0');
  }
}
inline void wt_L(long long x){
  int s=0;
  int m=0;
  char f[20];
  if(x<0){
    m=1;
    x=-x;
  }
  while(x){
    f[s++]=x%10;
    x/=10;
  }
  if(!s){
    f[s++]=0;
  }
  if(m){
    my_putchar_unlocked('-');
  }
  while(s--){
    my_putchar_unlocked(f[s]+'0');
  }
}
inline void wt_L(unsigned long long x){
  int s=0;
  char f[21];
  while(x){
    f[s++]=x%10;
    x/=10;
  }
  if(!s){
    f[s++]=0;
  }
  while(s--){
    my_putchar_unlocked(f[s]+'0');
  }
}
int WRITER_DOUBLE_DIGIT = 15;
inline int writerDigit_double(){
  return WRITER_DOUBLE_DIGIT;
}
inline void writerDigit_double(int d){
  WRITER_DOUBLE_DIGIT = d;
}
inline void wt_L(double x){
  const int d = WRITER_DOUBLE_DIGIT;
  int k;
  int r;
  double v;
  if(x!=x || (x==x+1 && x==2*x)){
    my_putchar_unlocked('E');
    my_putchar_unlocked('r');
    my_putchar_unlocked('r');
    return;
  }
  if(x < 0){
    my_putchar_unlocked('-');
    x = -x;
  }
  x += 0.5 * pow(0.1, d);
  r = 0;
  v = 1;
  while(x >= 10*v){
    v *= 10;
    r++;
  }
  while(r >= 0){
    r--;
    k = floor(x / v);
    if(k >= 10){
      k = 9;
    }
    if(k <= -1){
      k = 0;
    }
    x -= k * v;
    v *= 0.1;
    my_putchar_unlocked(k + '0');
  }
  if(d > 0){
    my_putchar_unlocked('.');
    v = 1;
    for(r=(0);r<(d);r++){
      v *= 0.1;
      k = floor(x / v);
      if(k >= 10){
        k = 9;
      }
      if(k <= -1){
        k = 0;
      }
      x -= k * v;
      my_putchar_unlocked(k + '0');
    }
  }
}
inline void wt_L(const char c[]){
  int i=0;
  for(i=0;c[i]!='\0';i++){
    my_putchar_unlocked(c[i]);
  }
}
inline void wt_L(string &x){
  int i=0;
  for(i=0;x[i]!='\0';i++){
    my_putchar_unlocked(x[i]);
  }
}
int fibonacci_mod_L(unsigned long long n, int md){
#if 0
  unsigned long long a=1;
  unsigned long long b=0;
  unsigned long long c=1;
  unsigned long long ma=1;
  unsigned long long mb=1;
  unsigned long long mc=0;
  unsigned long long ta;
  unsigned long long tb;
  unsigned long long tc;
  while(n){
    if(n%2){
      ta = a*ma + b*mb;
      tb = a*mb + b*mc;
      tc = b*mb + c*mc;
      a = ta % md;
      b = tb % md;
      c = tc % md;
    }
    ta = ma*ma + mb*mb;
    tb = ma*mb + mb*mc;
    tc = mb*mb + mc*mc;
    ma = ta % md;
    mb = tb % md;
    mc = tc % md;
    n/=2;
  }
  return b;
#else
  unsigned long long a=1;
  unsigned long long b=0;
  unsigned long long ma=0;
  unsigned long long mb=1;
  unsigned long long ta;
  unsigned long long tb;
  while(n){
    if(n%2){
      ta = a*ma + b*mb;
      tb = a*mb + b*(ma+mb);
      a = ta % md;
      b = tb % md;
    }
    ta = ma*ma + mb*mb;
    tb = (ma*2 + mb)*mb;
    ma = ta % md;
    mb = tb % md;
    n/=2;
  }
  return b;
#endif
}
int main(){
  long long n;
  rd(n);
  wt_L(fibonacci_mod_L(n+1,998244353)-1);
  wt_L('\n');
  return 0;
}
template<class T> inline void wt_L(vector<T> x){
  int fg = 0;
  for(auto a : x){
    if(fg){
      my_putchar_unlocked(' ');
    }
    fg = 1;
    wt_L(a);
  }
}
template<class T> inline void wt_L(set<T> x){
  int fg = 0;
  for(auto a : x){
    if(fg){
      my_putchar_unlocked(' ');
    }
    fg = 1;
    wt_L(a);
  }
}
template<class T> inline void wt_L(multiset<T> x){
  int fg = 0;
  for(auto a : x){
    if(fg){
      my_putchar_unlocked(' ');
    }
    fg = 1;
    wt_L(a);
  }
}
template<class T1, class T2> inline void wt_L(pair<T1,T2> x){
  wt_L(x.first);
  my_putchar_unlocked(' ');
  wt_L(x.second);
}
// cLay version 20220116-1

// --- original code ---
// ll@n;wt(fib_mod(n+1,998244353)-1);