- #include <iostream> 
- using namespace std; 
-   
- int main() { 
- 	int h1, m1, h2, m2, result = 0; 
- 	cin >> h1 >> m1 >> h2 >> m2; 
- 	while(true) { 
- 		if(m1 == 0) { 
- 			result += h1 > 12 ? h1 - 12 : h1 == 0 ? 12 : h1; 
- 		} else if(m1 == 30) { 
- 			result++; 
- 		} 
- 		if(h1 == h2 && m1 == m2) { 
- 			break; 
- 		} 
- 		m1++; 
- 		if(m1 == 60) { 
- 			m1 = 0; 
- 			h1++; 
- 		} 
- 	} 
- 	cout << result << endl; 
- 	return 0; 
- } 
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