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#include <iostream> //#include <bits/stdc++.h> using namespace std; long long sleden_deliv_so_5(long long x) { while(x % 5 != 0) { x++; } return x; } long long prethoden_deliv_so_5(long long x) { while(x % 5 != 0) { x--; } return x; } int main() { long long x, y; cin >> x >> y; long long minimum = ceil(20.0 * x / 19.0); long long maksimum = floor(10.0 * x / 9.0); if(maksimum > y) { maksimum = y; } if(minimum % 5 != 0){ minimum = sleden_deliv_so_5(minimum); } if(maksimum % 5 != 0) { maksimum = prethoden_deliv_so_5(maksimum); } if(minimum > maksimum) { cout << 0 << endl; } else { cout << (maksimum - minimum) / 5 + 1 << endl; } }
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