#include using namespace std; #define MOD 1000000007 #define INF 100000000 #define MAX 100001 #define int ll #define ll long long #define ld long double #define vi vector #define pa pair #define pb push_back #define mp make_pair #define INIT ios::sync_with_stdio(false);cin.tie(0); #define VAR(type, ...)type __VA_ARGS__;MACRO_VAR_Scan(__VA_ARGS__); template void MACRO_VAR_Scan(T& t) { cin >> t; } templatevoid MACRO_VAR_Scan(First& first, Rest&...rest) { cin >> first; MACRO_VAR_Scan(rest...); } #define VEC(type, c, n) vector c(n);for(auto& i:c)cin>>i; #define MAT(type, c, m, n) vector> c(m, vector(n));for(auto& r:c)for(auto& i:r)cin>>i; #define BR cout << "\n"; #define SP cout << " "; #define ENDL cout<=0;--i) #define FOR(i, m, n) for(int i = m;i < n; i++) #define RFOR(i, a, b) for(int i=(a)-1;i>=(b);--i) #define AREP(a, n) for(auto (a):(n)) #define ALL(a) (a).begin(),(a).end() #define IN(n, a, b) ((a)<=(n)&&(n)<(b)) signed main(){ INIT; VAR(int, n); int d = sqrt(n / 3); if(d == 0) d++; OUTL(d); RET;}