#include <iostream>
#include <string>
int main()
{
int liczba = 1234981331;
std::string lanuch = std::to_string(liczba);
int licznik = 0;
for (int i = 0; i < lanuch.length(); i++)
if (lanuch[i] == '1') licznik++;
std::cout << licznik << std::endl;
}
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