static int ways ( int i , int arr [ ] , int n ) {
  if ( i == n - 1 ) return 1 ;
  int sum = 0 ;
  for ( int j = 1 ;
  j + i < n && j <= arr [ i ] ;
  j ++ ) {
    sum += ( ways ( i + j , arr , n ) ) % mod ;
    sum %= mod ;
  }
  return sum % mod ;
}

static int ways ( int i , int arr [ ] , int n ) { if ( i == n - 1 ) return 1 ; int sum = 0 ; for ( int j = 1 ; j + i < n && j <= arr [ i ] ; j ++ ) { sum += ( ways ( i + j , arr , n ) ) % mod ; sum %= mod ; } return sum % mod ; }
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