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