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