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#include <iostream> #include <string> using namespace std; int main() { int a, b = 0; cin >> a; for (int i = 1; i < a+1; i++){ b += i; } cout << b; }
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#include <iostream> #include <string> using namespace std; int main() { int a, b = 0; cin >> a; for (int i = 1; i < a+1; i++){ b += i; } cout << b; }