#include <stdio.h>

int main(void) {
    char S[101];
    int i,C = 0;
    
    scanf("%s", S);
    for (i = 0; S[i] != 0; i++) {
    	if (S[i] == 'm'&&S[i+1] == 'i') {
    		C++;
    	}
    }
    printf("%d", C);
}