#include using namespace std; int main() { int n, c, count = 0; //a:10的个数,b:20的个数,c:50的个数 cin >> n; //n元钞票 for (c = 0; c <= 2 * n / 100; c++) //count += 5 * (n - c * 50) / 100 + 1; count += (n - c * 50) / 20 + 1; cout << count << endl; return 0; }