#include <stdio.h>
int gcd(int a, int b) {
while (b != 0) {
int temp = b;
b = a % b;
a = temp;
}
return a;
}
int gcd3(int a, int b, int c) {
return gcd(gcd(a, b), c);
}
int main() {
int m, n, o;
scanf("%d%d%d", &m, &n, &o);
printf("%d\n", gcd3(m, n, o));
return 0;
}
