#include <stdio.h>
#define I 1
#define V 5
#define X 10
#define L 50
#define C 100
#define D 500
#define M 1000

int main(void)
{
    long vys=0;
    short cnt=0;
    int state=I;
    int cn=0;
    char a[10000];
    while (gets(a)!=NULL)
    {
        /*printf("%s ",a);*/
        for(cn=0;a[cn]!=0;cn++);
	cn--;
        /*printf("  %d",cn);*/
	vys=0;
	state=I;
	cnt=0;
	for(;cn>=0;cn--)
	{
	    if (state==I && a[cn]=='i') 
	    {
		state=I;
		cnt++;
		if (cnt==3){state=V;cnt=0;}
		vys++;
		/*printf("i %d",vys);*/
	    }
	    if (state<=V && a[cn]=='v')
	    {
		state=X;
		vys+=5;
		/*printf("v %d",vys);*/
	    }
	    if (state<=X && a[cn]=='x')
	    {
		state=X;
		cnt++;
		if(cnt==3){state=L;cnt=0;}
		vys+=10;
		/*printf("x %d",vys);*/
	    }
	    if (state<=L && a[cn]=='l')
	    {
		state=C;
		vys+=50;
		/*printf("l %d",vys);*/
	    }
	    if (state<=C && a[cn]=='c')
	    {
		state=C;
		cnt++;
		if(cnt==3){state=D;cnt=0;}
		vys+=100;
		/*printf("c %d",vys);*/
	    }
	    if (state<=D && a[cn]=='d')
	    {
		state=M;
		vys+=500;
		/*printf("d %d",vys);*/
	    }
	    if (state<=M && a[cn]=='m')
	    {
		state=M;
		vys+=1000;
		/*printf("m %d",vys);*/
	    }
	}
	printf("%ld\n",vys);
    }
    return 0;
}