#include	<stdio.h>
int main ( int argc, char *argv[] )
{
    int a[2] = {0};
    int f = 0;
    char buf[500] = {0};
    scanf ( "%[^\n]",  buf);
    char *p = buf;
    while(*p !='\0')
    {
        if(*p==' ')
            f++;
        else
            a[f] += *p-'0';
        p++;
    }
    printf ( "%d\n", a[0]*a[1] );
    return 0;
}				/* ----------  end of function main  ---------- */