func_code_string: #include <bits/stdc++.h>   using namespace std;   int read(int &x) { return scanf( %d , &x); }   int read(int &x, int &y) { return scanf( %d%d , &x, &y); }   int read(int &x, int &y, int &z) { return scanf( %d%d%d , &x, &y, &z); }   int read(long long &x) { return scanf( %lld , &x); }   int read(long long &x, long long &y) { return scanf( %lld%lld , &x, &y); }   int read(double &x) { return scanf( %lf , &x); }   char buff[2000010];   int read(string &s) {     int r = scanf( %s , buff);     s = buff;     return r;   }   int main() {     vector<int> PHI(1000002);     for (int i = 1; i < PHI.size(); ++i) {       PHI[i] = i;     }     for (int i = 2; i < PHI.size(); ++i) {       if (PHI[i] == i) {         for (int j = i; j < PHI.size(); j += i) {           PHI[j] = PHI[j] / i * (i - 1);         }       }     }     int N, K;     read(N, K);     if (K == 1) {       cout << 3 << endl;       return 0;     }     sort(PHI.begin() + 3, PHI.begin() + N + 1);     cout << accumulate(PHI.begin() + 3, PHI.begin() + 3 + K, 2LL) << endl;   }   