#include #include #include #include #include #include #include #include using namespace std; const int INF = 0x3f3f3f3f; int main() { int l , r , sum = 0; cin >> l >> r; if(l % 2 == 1) l++; for(int i = l;i <= r;i += 2) { for(int j = 3;j <= i;j += 2) { int t = i - j; if(t < j) { break; } int flag = 1; for(int k = 3;flag == 1 && k * k <= j;k++) { if(j % k == 0) flag = 0; } for(int k = 3;flag == 1 && k*k <= t;k++) { if(t % k == 0) flag = 0; } if(flag == 0) { continue; } else { cout << j << "+" << t << "=" << i << endl; sum++; }

}
}
cout << sum << endl;
return 0;

}