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#include <cstdio>
#include <cstring>

// low numbers
int ileznakow(long long &m, long long current) {
	long long pow = 1;
	int znak = 0;
	while(1) {
		znak++;
		pow *= 10;
		if (current*pow <= m) {
			long long roz = m - current*pow;
			if (roz < pow-1) {
				m = current*pow + roz + 1;
				return znak;
			}
		} else {
			m = current*pow;
			return znak;
		}
	}
}
// high numbers

int compare(char *a, char *b) {
	int i;
	for (i=0; a[i] && b[i]; ++i) {
		if (a[i] < b[i])
			return -1;
		if (a[i] > b[i])
			return 1;
	}
	return 0;
}

int maxZeros(int z) {
	switch(z) {
		case 0: return 0;
		case 1: return 9;
		case 2: return 99;
		case 3: return 999;
		case 4: return 9999;
		case 5: return 99999;
		default: return 999999;
	}
}

int main() {
	int k;
	long long llmin;
	long long minzeros = 0;

	long long llcurrent;
	long long sum = 0;

	int zeros = 0;
	int zerow = 0;

	char min[20];
	char current[20];

	int alg = 1;

	scanf("%d", &k);
	scanf("%lld", &llmin);

	for (int i=1; i<k; ++i) {
		if (alg) {
			scanf("%lld", &llcurrent);
			if (llcurrent > llmin) {
				llmin = llcurrent;
				continue;
			}

			sum += ileznakow(llmin, llcurrent);

			if (llmin > 1e16) {
				sprintf(min, "%lld", llmin);
				alg = 0;
			}

		} else {
			scanf("%s", current);
			int result = compare(min, current);
			if (result < 0) {
				int lenm = strlen(min) + zeros;
				int lenc = strlen(current);
				zeros = lenm-lenc;

				if (zeros < 0)
					zeros = 0;

				zerow = 0;
			} else if (result == 0) {
				int lenm = strlen(min);
				int lenc = strlen(current);

				if (lenm > lenc)
					strcmp(min, current);

				lenm = lenm + zeros;
				lenc = lenc;

				zeros = lenm - lenc;

				if (zerow < maxZeros(zeros))
					zerow++;
				else {
					zeros++;
					zerow = 0;
				}
			} else if (result > 0) {
				int lenm = strlen(min) + zeros;
				int lenc = strlen(current);
				zeros = lenm - lenc + 1;

				if (zeros < 0)
					zeros = 0;

				zerow = 0;
			}

			sum += zeros;
			strcpy(min, current);

//			int ii,j;
//			char buffer[1000];
//			strcpy(buffer, min);
//			for (ii=0; buffer[ii]; ++ii);
//			for (j=0; j<zeros; ++j)
//				buffer[ii+j] = '0';
//
//			buffer[ii+j] = 0;
//			printf("Min: %s | zeros: %d zerow: %d\n", buffer, zeros, zerow);
		}
	}

	printf("%lld\n", sum);

	return 0;
}