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#include <iostream>
#include<cmath>
using namespace std;
int main()
{
string strnum = "111";
int decimal;
int size;
size = strnum.size();
for (int counter = 0; counter < size; counter++)
{
if (strnum[counter] == '1')
decimal = (decimal + pow(2.0,counter));
else
decimal = (decimal + pow(0.0,counter));
}
cout<<decimal<<endl;
return 0;
}
