#include<stdio.h>
int GCD(int x,int y){
    int z;
    while(x%y!=0){
        z=x%y;
        x=y;
        y=z;
    }
    return y;
}
int main(){
    int a,b,c;
    scanf("%d %d %d",&a,&b,&c);
    int d=GCD(a,b);
    d=GCD(c,d);
    printf("%d",d);
    return 0;
}

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