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本人急刷题解仙人。点个赞吧呜呜呜呜，球球了

#include <iostream>


using namespace std; 

int main() { 
int a;
int num; 

while (cin >> num) {  
    a.push_back(num); 
    if (cin.get() == '\n') break; 
}

int x, y;  
cin >> x >> y;  
cout << a[x - 1] + a[y - 1] << endl;

return 0; 
}