1.60MB&&835ms

#include<cstdio>
int main(){
    int a,b,c;
    scanf("%d %d %d",&a,&b,&c);
    int min;if(a<b&&a<c)min=a;else if(b<a&&b<c)min=b;else if(c>a&&c>b)min=c;
    for(int i=min;i>=1;i--){
        if(a%i==0&&b%i==0&&c%i==0){
            printf("%d",i);break;
        }
    }
}