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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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