#include <stdio.h>

main() {
    int X, Y, L;
    int count = 0;
    
    scanf("%d %d %d", &X, &Y, &L);
    
    if (Y < 0) {
        count = 2;
        Y = -Y;
    }
    
    count += L/Y;
    if (L%Y > 0)
        count++;
    
    if (X < 0) {
        X = -X;
        count++;
    } else if (X > 0) {
       count++;
    }
    
    count += L/X;
    if (L%X > 0)
        count++;
        
    printf("%d\n", count);
}