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#include <bits/stdc++.h>
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using namespace std;
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int x, n, sum;
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int main() {
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cin >> x >> n;
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//提示孩子们需要注意边界，可以按最小范围进行模拟，来推测抽象时情况
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for (int i = x; i <= x + n - 1; i++) {
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if (i % 7 == 6 || i % 7 == 0) continue;
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sum += 250;
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}
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printf("%d", sum);
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return 0;
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} |
