#define _USE_MATH_DEFINES #include #include #include #include #include #include //#include #include #include #include #include #include #include ///////// #define REP(i, x, n) for(int i = x; i < n; i++) #define rep(i,n) REP(i,0,n) #define P(p) cout<<(p)< ///////// typedef long long LL; typedef long double LD; ///////// using namespace::std; ///////// int bitcount(LL num){ int ans = 0; while(num){ if(num%2 == 1)++ans; num /= 2; } return ans; } int main(void){ std::cin.tie(0); std::ios::sync_with_stdio(false); std::cout << std::fixed;// cout << setprecision(16);// LL N; cin>>N; LL pos = 1; LL ans = 1; LL add; while(pos < N){ add = bitcount(pos); pos += add; ++ans; if( add == 0 ){ break; } } if(pos == N){ P(ans); }else{ P(-1); } return 0; }