#include <bits/stdc++.h>

using namespace std;

#define INF 100000000
#define YJ 1145141919
#define INF_INT_MAX 2147483647
#define INF_LL 9223372036854775
#define INF_LL_MAX 9223372036854775807
#define EPS 1e-10
#define MOD 1000000007
#define MOD9 998244353
#define Pi acos(-1)
#define LL long long
#define ULL unsigned long long
#define LD long double

#define int long long

using II = pair<int, int>;

int gcd(int a, int b) { return b != 0 ? gcd(b, a % b) : a; }
int lcm(int a, int b) { return a * b / gcd(a, b); }
int extgcd(int a, int b, int &x, int &y) { int g = a; x = 1; y = 0; if (b != 0) g = extgcd(b, a % b, y, x), y -= (a / b) * x; return g; }

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(a)  begin((a)), end((a))
#define RALL(a) (a).rbegin(), (a).rend()
#define PB push_back
#define MP make_pair
#define SZ(a) int((a).size())

const int MAX_P = 3205;
const int MAX_K = 10000;

const int ANS[] = {0,493438984,2111951377,4934219787,9001617396,14343475240,20983549232,28938411754,38222337945,48855592736,60838190672,74193687476,88921806577,105036084674,122543360219,141448665788,161762066784,183487293576,206644111130,231208670456,257212470774,284661691691,313538542845,343862458416,375639765395,408875452660,443559968601,479723200366,517333062431,556419507715,596981215450,639007377350,682529770555,727538683373,774009411906,821990325762,871476277626,922424492974,974880028674,1028856951678,1084296609104,1141266683482,1199769931446,1259717167514,1321237832726,1384261675499,1448776778605,1514816915551,1582401743782,1651519869360,1722125036282,1794261310039,1867938145253,1943162263556,2019919516903,2098185047461,2177990752180,2259356996967,2342246760421,2426683306008,2512661322551,2600202380059,2689253635198,2779911682839,2872076940842,2965792104633,3061088597282,3157923865183,3256297470052,3356283349093,3457770622390,3560833491555,3665505698976,3771665000331,3879451580190,3988800240289,4099689915648,4212156072325,4326227368544,4441788452022,4558987534475,4677840157734,4798099997041,4920000663900,5043552008724,5168559295617,5295214000044,5423487803310,5553301601415,5684679342328,5817729717828,5952248621195,6088428461000,6226149254802,6365487771753,6506418585007,6648988032736,6793042552516,6938843502589,7086136299955,7235062807366,7385497922168,7537595029369,7691272542181,7846594285002,8003510992854,8162003209593,8322065666301,8483854862004,8647160290700,8812039622862,8978549345553,9146706496165,9316419043328,9487781973018,9660719955296,9835269787927,10011553756671,10189253411315,10368667669769,10549659220862,10732401846534,10916579731860,11102453274617,11289904537263,11479011688245,11669830174971,11862029769733,12056063349904,12251617620346,12448845177256,12647680629690,12848171370860,13050254462297,13253960158691,13459323658561,13666226110773,13874834196455,14085094521507,14296814468805,14510332007222,14725429439492,14942131234656,15160521193552,15380588954554,15602136739002,15825403657376,16050451660910,16276847020856,16505115662434,16734924755096,16966264626222,17199447614438,17434170056672,17670514459840,17908481787130,18148241497132,18389471243932,18632333327852,18877006937424,19123138141378,19371049907390,19620742818748,19871685989154,20124476869606,20379057733244,20634980880846,20892786409876,21152210987700,21413258654304,21675833225770,21940306512852,22206142281006,22473855635042,22743180271196,23013964372551,23286698574789,23560888221575,23836769564907,24114378406399,24393634293809,24674416929987,24956947315787,25241193314980,25526998756870,25814409354826,26103616946734,26394550063000,26686893099848,26981155333407,27276821356759,27574386655175,27873535407821,28174159348173,28476594164494,28780788606772,29086633471688,29393966055558,29703149003024,30013792137851,30326413365285,30640395292273,30956069654443,31273523102626,31592664449728,31913376078550,32235842932848,32560029990049,32885785039643,33213220430143,33542358268005,33873031165364,34205581585566,34539604444304,34875425263721,35212812420453,35552154166961,35892886791151,36235517412420,36579557281204,36925459066686,37272877068179,37622167432867,37972983625527,38325669456310,38679944926812,39035687683706,39393229506853,39752627629789,40113337934391,40476248899052,40840525066648,41206411398402,41574140883741,41943676682207,42314367955206,42687136285026,43061485153064,43437687786881,43815302669763,44194833598353,44575932486140,44959075432376,45343572745399,45729521171181,46117511559977,46507039889452,46898189118372,47291122961301,47685728865579,48081994935671,48480082300526,48879970671808,49281110607237,49684086992257,50088943167842,50495479917520,50903466600692,51313347525789,51724975620189,52138123487538,52553108327972,52969581501827,53387767611137,53807963320230,54229542299288,54653198694933,55078208662363,55504960390211,55933215747316,56363615930452,56795212776465,57228909958313,57664215816822,58101239718024,58539707599783,58980252241083,59421892348898,59865706329526,60311259225171,60758384185743,61207170466520,61657753740090,62110005557983,62563875183571,63019567631040,63476896129040,63935958271999,64396829979171,64859270285018,65323182791149,65789089604569,66256629418190,66725831508196,67197154766221,67669778128369,68143846134308,68620152785028,69098036648615,69577694425039,70058785460280,70541587609951,71025938505929,71512452345322,72000611436936,72490226710653,72981712491617,73474739478198,73969802569251,74466324672669,74964555109988,75464743316958,75966455520027,76469922185833,76974918304364,77481786106093,77990116976087,78500489297008,79012557024984,79526167516159,80041527790312,80558645237098,81077594980197,81598055713779,82120713079294,82644353395127,83169941989863,83697504542732,84226394594512,84757231028297,85290161753688,85823956198104,86359994965751,86897880537014,87437307393462,87978318105507,88521402624739,89065833437896,89612148645041,90160177388367,90709780843282,91261462998831,91814670146287,92369737296000,92925795939321,93484427284737,94044459497514,94605692593587,95169619029369,95734736626700,96301520878991,96871003843775,97440790250114,98012538259925,98586604492967,99162032503100,99739464176165,100318795327755,100899258277840,101481591756225,102065855149715,102652068778038,103239275746737,103829147617875,104419705255676,105012670748303,105607087655847,106203258904286,106801251505039,107401147943134,108002269398516,108605669699699,109210412671028,109816898593848,110425621805189,111035349416856,111647260553880,112260978633767,112876414074318,113493082165965,114111807921375,114732129627940,115354581555727,115978374551469,116604201140710,117231448199853,117860345420030,118491457697962,119123896922237,119758228396194,120394329084663,121032207586387,121671762836798,122312774834877,122955612335878,123600339753238,124247228070109,124895026488944,125544979006721,126196993528335,126850549017804,127505199391685,128162238812474,128820653080288,129480852076751,130143314566922,130806818828029,131472491663433,132139863485890,132808680912837,133479467089246,134152010492156,134826295251391,135502107129054,136180066055547,136859038394801,137540475359704,138223390236401,138908157808408,139594113155195,140282617787827,140971935053758,141664050636387,142357602038586,143052689302720,143749192448739,144447897755264,145148497213081,145850281904976,146554080642842,147259491582477,147967040134080,148676185176293,149386679322656,150099453429042,150813537261139,151529826444886,152247135978549,152966937395338,153688169519778,154411235469265,155136321517588,155862218888277,156590458911006,157320579912726,158052520943755,158785663003084,159521080147969,160258283568446,160996569067233,161737467121483,162479234078350,163223256696949,163968850251200,164716254597751,165465511572167,166216722634706,166969089792981,167723475231634,168479936246421,169238102781982,169997490957786,170759095684543,171522119425146,172287112634491,173053807479870,173822301914317,174592676086419,175364856374134,176138491780787,176913242475822,177690692049615,178469553728962,179250407544097,180032530244167,180816973674988,181603061170895,182390930796476,183179904404611,183971218922672,184764302482181,185559352780607,186355484716640,187154167627305,187954463112172,188755167873661,189559787774578,190364265283477,191171258442543,191980195355334,192790925674795,193602556410512,194417016305967,195232645987818,196050188214189,196869911666370,197690504888822,198513424115241,199337980967136,200164364728679,200992441246692,201822370836189,202653868317500,203487295124995,204322582138612,205159280851458,205997845055705,206838686419778,207680223459897,208524389546180,209370037656611,210217713280204,211066783506201,211918221290312,212770051652978,213624780221079,214480891817874,215339170446071,216198966217860,217060656926613,217923890158764,218789180815693,219655779282864,220523735657387,221394090749349,222266481117362,223140061833265,224016558533452,224893676139605,225772746863650,226653316365413,227536174732100,228421314666947,229306948564404,230195066828025,231084619915589,231976153079776,232869522913489,233764396646712,234661096550023,235560022983960,236459761443283,237361938411048,238265786958041,239171714912618,240079430075503,240988397832690,241898812660791,242812185647676,243726278270952,244642548171917,245560254111198,246480586961269,247401317616792,248324577480015,249249827129502,250176645559885,251105483218834,252035928916781,252967864735060,253902107151677,254838098382990,255774984445791,256713920805122,257655416928771,258598042267722,259542772930910,260489350267409,261436917320998,262386403483379,263338334303632,264291434634157,265246857118052,266204009065415,267162706932416,268122443879733,269085526198458,270049088960461,271015374238472,271982522915917,272951354222680,273922507156707,274895612421442,275870379762381,276846598740350,277825672031685,278804570050134,279786370749447,280770739235134,281755465246921,282742772106696,283731559078148,284721682929865,285714250695616,286708743387977,287704245795420,288702721195441,289702014807874,290703569309949,291706201453858,292711324081941,293717366474056,294725901925083,295736053976404,296747592638013,297762174014958,298776908022377,299794469887084,300813564019813,301834201727288,302856699362737,303880788840754,304907289654363,305934819862268,306964702346215,307996718856936,309029824258801,310064151223148,311101637905109,312139951524896,313180253381239,314222805621412,315266553457537,316312042620248,317360134362523,318409439232054,319460499426217,320513384122962,321567622851745,322623930942812,323682486495499,324741853391528,325803695787761,326867219740652,327932450455477,328999565677832,330068744316709,331139300028798,332211422630039,333285673740620,334361760892115,335439825691086,336519086109011,337600169846864,338683695663679,339768196320246,340854960383245,341943058696612,343034472400869,344126288365936,345219904513529,346315581629252,347412434557053,348511792968136,349613032606555,350715682647270,351819912216247,352926548527444,354034344501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int N;
vector<int> prime;
bool used[MAX_P];

signed main()
{
  FOR(p,2,MAX_P) {
    if (!used[p]) {
      prime.push_back(p);
      for(int k = 1; k*p < MAX_P; k++) {
        used[k*p] = true;
      }
    }
  }

  cin >> N;

  int ans = ANS[N/MAX_K];
  int S = N/MAX_K*MAX_K + 1;
  FOR(_n,S,N+1) {
    int n = _n;
    int tmp = 1;
    for(int p : prime) {
      if (n < p) {
        break;
      }
      int cnt = 0;
      while(n%p == 0) {
        n /= p;
        cnt++;
      }
      tmp *= (cnt+1);
    }
    if (n != 1) {
      tmp *= 2;
    }
    ans += tmp*_n;
  }

  cout << ans << endl;

  return 0;
}


Measured memory_bytes: 3628