#include <stdio.h>
#include <string.h>



int preved(char a)
{
	if (a == 'i') {
		return 1;
	} else if (a == 'v') {
		return 5;
	} else if (a == 'x') {
		return 10;
	} else if (a == 'l') {
		return 50;
	} else if (a == 'c') {
		return 100;
	} else if (a == 'd') {
		return 500;
	} else if (a == 'm') {
		return 1000;
	} else {
		return 0;
	}

} 

int vyries(char* a)
{
	int i;
	char cisla[10001];
	int actual = 0;
	int hodnota = 0;
	
	/*printf("dlzka vstupu a = %d\n", strlen(a));*/
/*	
	if (strlen(a) < 2) {
		printf("0\n");
		return 0;
	}
*/	
	i = 0;
	
	while (i < strlen(a)+1) {
		int j = i+1;
		while (a[j] == a[i]) {
			j++;
		}
		
		if (preved(a[i]) < preved(a[j])) {
			/* zahodime iba ak daky specialny pripad */
			/*
			if (a[i] == 'i' && a[j] == 'v') {
				cisla[actual] = a[i];
				actual++;
			}*/
			if (a[i] == 'i' && a[j] == 'v') {
				cisla[actual] = a[i];
				actual++;
			} else if (a[i] == 'i' && a[j] == 'x') {
				cisla[actual] = a[i-1];
				actual++;
			} else if (a[i] == 'x' && a[j] == 'l') {
				cisla[actual] = a[i];
				actual++;
			} else if (a[i] == 'x' && a[j] == 'c') {
				cisla[actual] = a[i];
				actual++;
			} else if (a[i] == 'c' && a[j] == 'd') {
				cisla[actual] = a[i];
				actual++;
			} else if (a[i] == 'c' && a[j] == 'm') {
				cisla[actual] = a[i];
				actual++;
			}

		} else {
			int k;
			for (k = i; k < j; k++) {
				cisla[actual] = a[k];
				actual++;
			}
		}

		i = j;
	}
	cisla[actual] = '\0';
	
	/*printf("dlzka cislo = %d\n", strlen(cisla));*/
	
	i = 0;	
	while (i < strlen(cisla) + 1) {
		if (preved(cisla[i-1]) < preved(cisla[i])) {
			if (cisla[i-1] == 'i' && cisla[i] == 'v') {
				hodnota += 4; 
				i++;
			} else if (cisla[i-1] == 'i' && cisla[i] == 'x') {
				hodnota += 9;
				i++;
			} else if (cisla[i-1] == 'x' && cisla[i] == 'l') {
				hodnota += 40;
				i++;
			} else if (cisla[i-1] == 'x' && cisla[i] == 'c') {
				hodnota += 90;
				i++;
			} else if (cisla[i-1] == 'c' && cisla[i] == 'd') {
				hodnota += 400;
				i++;
			} else if (cisla[i-1] == 'c' && cisla[i] == 'm') {
				hodnota += 900;
				i++;
			}
		} else {
/*			printf("normalne pridava %d\n", preved(cisla[i-1]));*/
			hodnota += preved(cisla[i-1]);
		}
		i++;
	}

	
	/*cisla[actual] = '\0'; */
	 

	/*if (strlen(a) > 1) {*/
/*		printf("%s --> %s --> %d\n", a, cisla, hodnota); */
	/*}*/

	
	return hodnota;
}

int main( void )
{
	while (1) {
		char cisla[10001];
		char a = 'a';
		int i = 0;
		while (a != '\n') {
			a = getchar();
			if (a == EOF) {
				cisla[i] = '\0';
/*				if (cisla[0] == '\0' && cisla[0] != '\n') {*/
				/*	printf("%d\n",vyries(cisla));*/
				/*}*/
				
				return 0;
			}
			if (a != '\n') {
				if (a=='i' || a=='v' || a=='x' || 
			   	    a=='l' || a=='c' || a=='d' || a=='m') {
					cisla[i] = a;
					i++;
				}
			}
		}
		cisla[i] = '\0';
		printf("%d\n", vyries(cisla));
	}
	return 0;
}