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#include <iostream> using namespace std; int main() { int n; cin >> n; int res = 2e9; for(int i = 0; i <= n; i++) { int d = 5 * i; if(d >= n) { if(res > i) { res = i; } } if(d <= n) { int s = n - d; s /= 10; if((n - d) % 10 != 0) { s++; } if(i >= s) { if(res > i + s) { res = i + s; } } } } cout << res << endl; return 0; }
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