#include <bits/stdc++.h> using namespace std; typedef signed long long ll; #undef _P #define _P(...) (void)printf(__VA_ARGS__) #define FOR(x,to) for(x=0;x<(to);x++) #define FORR(x,arr) for(auto& x:arr) #define ITR(x,c) for(__typeof(c.begin()) x=c.begin();x!=c.end();x++) #define ALL(a) (a.begin()),(a.end()) #define ZERO(a) memset(a,0,sizeof(a)) #define MINUS(a) memset(a,0xff,sizeof(a)) //------------------------------------------------------- ll N,L; const int prime_max = 11000000; int NP,prime[1100000],divp[prime_max]; void cprime() { for(int i=2;i<prime_max;i++) if(divp[i]==0) { //M[i]=NP; prime[NP++]=i; for(ll j=1LL*i*i;j>i&&j<prime_max;j+=i) divp[j]=i; } } void solve() { int i,j,k,l,r,x,y; string s; cprime(); cin>>N>>L; ll ret=0; for(i=2;i<=L;i++) if(divp[i]==0) { int a=i*(N-1); if(a>L) break; ret += L+1-a; } cout<<ret<<endl; } int main(int argc,char** argv){ string s;int i; if(argc==1) ios::sync_with_stdio(false), cin.tie(0); FOR(i,argc-1) s+=argv[i+1],s+='\n'; FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin); solve(); return 0; }