C ++ , My for loop doesn't work when I run it on the terminal. Any ideas?

When I run it on the terminal it works fine but the loop. The for loop just doesn't do anything at all. I'm learning C++, so I don't know much.

#include <iostream>
#include <cstring>

using namespace std;
   int main( int argc, char *argv[] ) {
if (argc == 2) {
    cout << "The first argument is " << argv[0] << endl;
    cout << "The second argument is " << argv[1] << endl;

} else if (argc > 2) {
    cout << "Too many arguments" << endl;
    exit(0);
} else {
    cout << "Only one argument" << endl;
    cout << "The argument is " << argv[0] << endl;
    exit(0);
}

if (atoi(argv[1]) < 0) {
    cout << "Error negative number" << endl;
    exit(0);

}
// this loop does not work, everything else does.

for (int i = 1; i >= atoi(argv[1]); i++){  
    int count = atoi(argv[1]--);
    cout << count << endl;
    int sum = sum + i;
}
cout << "The sum is: " << endl;
return(0);}

I think that could be the if statements what are messing around with the loop.