
```cpp
#include<iostream>
using namespace std;
int main(){
    cout<<"18446744073709552000";
    return 0;
}
```


到底错在哪了啊[:白眼][:白眼][:白眼]

```cpp
#include <bits/stdc++.h>
using namespace std;
int main() {
    unsigned long long sum = 0;
    unsigned long long grains = 1;

    for (int i = 1; i <= 64; ++i) {
        sum += grains;
        grains *= 2;
    }
    cout << sum;

    return 0;
}
```


这不对吗？？

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