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#include <iostream>
#include <cmath>
#include <iomanip>
#include <cstdlib>
using namespace std;
int main(){
int t;
cin >> t;
int a=0;
int isT = 0;
long long summ = 0;
do {
if (isT == 1) {
summ += a;
}
cin >> a;
if (a == t ) isT ++;
} while ( isT != 2);
cout << summ - t;
}
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