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#include <stdio.h>
#include <stdlib.h>
int gcd(int a,int b){
    while(b!=0){
        int temp=a%b;
        a=b;
        b=temp;
    }
    return abs(a);
}
int main(void){
    int a,b,c,temp;
    scanf("%d %d %d", &a, &b,&c);
    temp=gcd(a,b);
    printf("%d", gcd(c,temp));

    return 0;
}