#include "stdlib.h"
#include "iostream.h"

int nwd(int a, int b) {
    if(a % b == 0) {
    return b;
    }
    else {
    int m = b;
    int n = a % b;
    int tmpa;
        while(m % n != 0) {
        tmpa = m;
        m = n;
        n = m % n;
        }
    return n;
    }
}

int main() {
cout << nwd(200, 190) << endl;
system("pause");
}