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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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int main () {
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int sum = 0;
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unsigned int p1,p2,r1,r2 = 0;
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while (scanf("%u-%u,%u-%u\n", &p1,&p2,&r1,&r2) != EOF) {
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if (((p1 <= r1) && (p2 >= r2)) || ((p1 >= r1) && (p2 <= r2)))
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sum +=1;
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}
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printf("%d\n", sum);
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}
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