简洁至上

#include <bits/stdc++.h>
using namespace std;

// 计算一个数的质因子个数
int zzz(int num) {
    int count = 0;
    for (int i = 2; i * i <= num; ++i) {
        while (num % i == 0) {
            ++count;
            num /= i;
        }
    }
    if (num > 1) {
        ++count;
    }
    return count;
}

int main() {
    int l, r;
    cin >> l >> r;

    int totalCount = 0;
    for (int i = l; i <= r; ++i) {
        totalCount += zzz(i);
    }

    cout << totalCount << endl;
    return 0;
}