int main(){
    int s=0,i=1,r=-1,m=-1,c;
    while((c=getchar())!=-1){
        if ('0'<=c){
            s+=(c-'0')*i;
            i*=10;
        }else{
            m=!r?(m+s):(r<0?s:(m*s));
            r=c=='+';
            i=1;s=0;
        }
    }
    printf("%d",!r?(m+s):(r<0?s:(m*s)));
    
    return 0;
}