#include
#include
int fun(int x){
int r=1,d,c;
while (1){
d = x % 10;
r = r * d;
x = (x - d) / 10;
if (x == 0) break;
}
return r;
}
main( ){
int num;
printf("input num\n");
scanf("%d",&num);
printf("%d",fun(num));
}