#include <bits/stdc++.h>

template<typename T> T in() { abort(); return T(); }
template<> std::string in() { std::string str; std::cin >> str; return str; }
template<> int in() { int x; scanf("%d", &x); return x; }

template<typename T> void out(T x) { abort(); }
template<> void out(const char* x) { printf("%s\n", x); }
template<> void out(std::string x) { std::cout << x << std::endl; }
template<> void out(int x) { printf("%d\n", x); }
template<> void out(long x) { printf("%ld\n", x); }


std::vector<int> primes;
bool isnotprime[11234567];
void init() {
  isnotprime[0] = isnotprime[1] = true;
  for(int i = 2; i < 11234; ++i) {
    if( isnotprime[i] ) continue;
    for(int j = i + i; j < 11234567; j+=i) {
      isnotprime[j] = true;
    }
  }
  for(int i = 0; i < 11234567; ++i) {
    if( not isnotprime[i] ) {
      primes.push_back(i);
    }
  }
}      

int main() {
  init();
  auto n = in<int>();
  auto x = in<int>();

  long res = 0;
  for(int p : primes) {
    int t = x - (n - 1) * p;
    if( t < 0 ) break;
    res += t + 1;
  }

  out(res);    
  
  return 0;
}