#define _USE_MATH_DEFINES #include //cin, cout #include //vector #include //sort,min,max,count #include //string,getline, to_string #include //fixed #include //setprecision #include //swap, pair #include //abs(int) #include //sqrt,ceil,M_PI, pow, sin #include //stringstream,getline #include //gcd, accumlate #include //deque #include //randam_device #include //numeric_limits using namespace std; constexpr long long int D_MOD = 1000000007; int main() { int A, B; cin >> A >> B; int ans = 3; for (int i = A; i <= B; i++) { if (i == 23 || i == 24 || i == 25) { ans--; } } cout << ans << endl; return 0; }